The Indus Civilization is known for which of the following?

(1) creating the first-known sanitation system.
(2) the building of highly functional multi-story buildings.
(3) the first-known use of negative numbers.
(4) the creation of anatomically-detailed figurines.

The Answer is two

The building of highly functional multi-story buildings

Explanation:

The Indus civilization was between 25000 BCE to 1700 BCE. Lasting from 3300 BCE to 1300BCE, Indus civilization also called the Indus valley civilization was an ancient civilization located in what is today called Pakistan and some part of INDIA. It is the earliest know urban culture of the Indian subcontinent at the bronze Age, South Asia. At it peak, the Indus valley has a population of about five million people. Some called it the Harappa civilization. Large cities of Mohenjo-daro and Harappa were built in the area

mint more silver currency sorry its probably to late.