In Mohenjo-Daro, as new houses were built atop old houses, walls were built higher so people could access the water from the higher housing. A. city

B. well

C. sewer

B. well

Explanation:

Mohenjo-Daro was a city that is in present-day Pakistan. It is considered to be one of the biggest settlements during the period of ancient Indus Valley Civilisation, and arguably one of the world's earliest major cities. According to archeological research, it was concluded Mohenjo-Daro had series of flooding which made new houses to be built atop old houses, WELL walls were built higher so people could access the water from the higher housing.

Hence, the right answer is WELL.