When externalities exist, buyers and sellers
a. neglect the external effects of their actions, but the market equilibrium is still efficient.
b. do not neglect the external effects of their actions, and the market equilibrium is efficient.
c. neglect the external effects of their actions, and the market equilibrium is not efficient.
d. do not neglect the external effects of their actions, and the market equilibrium is not efficient.

The correct answer is option c.

Explanation:

An externality refers to the situation when a third person who is not directly involved in the production or consumption of a good or service has to bear the cost.  

Externalities can be both positive as well as negative. Positive externalities are called external benefits and negative externalities are called external costs.  

These externalities lead to inefficient allocation and cause market failure.  

The buyers and sellers generally neglect the externalities that they create, and the market equilibrium is not efficient. In this situation, the government has to intervene in the market to correct externalities and efficiently allocate resources.

the correct answer option is b. a single paragraph.

explanation:

when you are thinking about paragraph​ topics, you should always choose a subject that can be adequately addressed in a single paragraph.

a paragraph is a piece of writing consisting of a few sentences that deal with a single theme. it has only a single idea that the paragraph revolves around and talks about.

so a paragraph topic must be chosen wisely where a single idea can be communicated in a single paragraph.

answer; management is about coping complexity and leadership is about coping with change; i believe this is correct; ///good luck                                          

(b) management: leadership