Which of these is a natural monopoly? cell phone service computer repair package delivery service sewage treatment

The correct answer is B. Sewage treatment

Explanation:

A monopoly is when a product, service or similar is only sold by one company or single seller, which means this company does not have any marketing competence. In the case of a natural monopoly, the high infrastructural cost of a service or product causes this product or service to be usually sold by only one company or monopoly. This usually occurs in services or products that require not only complex infrastructures but also, unique materials or unique technology to operate. Additionally, natural monopolies can be beneficial as one company can sell a specific service or product in extensive areas such as towns or cities. Sewage treatment is usually a natural monopoly as this service requires complex infrastructure and technology, considering the process of removing contaminants from wastewater is complex and requires a lot of energy and infrastructure the service is usually sold by only one company which make it a natural monopoly. Also in the case of cell phone service, computer repair or package delivery these services are not linked to expensive infrastructure or complex technology and thus there are multiple companies that sold them, which implies they are not a natural monopoly.

1960: wilma rudolph was the first woman to win three olympic gold medals in track and field at one olympic games. she was an american sprinter from tennessee, she was acclaimed the fastest woman in the world. she was among the most visible black women in america and abroad. she became a role model for black and female athletes. she was also known as a civil rights and women right's pioneer.

1973: billy jean king is an american former number one tennis player. she represented the united states in the federal cup and the wightman cup. for three years she was the usa's captain in the federation cup. she defends gender equality and has been a pioneer for equal and social justice. at the age of 29, she won "the battle of sexes" tennis match against the 55 year old bobby riggs. she was also the founder of women's tennis association and the women's sports foundation.  

1983: tamara mckinney becomes the first american female skier to win the alpine world cup overall championship top. she was the only american to hold that title for a quarter century until 2008.

1992: manon rhéaume, from canada,   becomes the only woman to start in a national hockey league game in an exhibition game for the tampa bay lightning . she played on the canada women's national ice hockey team winning gold medals in 1992 and 1994. and silver medals in 1998. manon marked the first time a woman appeared in a regular season professional game with her first appearance against the salt lake golden eagles.

2013: serena williams won 78 of 82 matches at the age of 31. she is an american professional tennis player. she reached the number 1 ranking for the first time on july, 8, 2002. at the age of 16, she played against karsten braasch the battle of sexes. she was the highest paid female athlete in 2016. she is a unicef ambassador .

definitely a for sure. ill see and update if i get the answer