Ancient Indians built complex houses with plumbing which included baths, toilets, running water and drains called 1. Apartment buildings

2. Sky risers

3. Tree houses

4. Complex houses

Please hurry and ansi

Tree houses

Explanation:

In simple words, the ancient Indians made their homes from the wood or sometimes even in the trees. They had high knowledge and included almost all modern facilities in such residences. However, the level of comfort was not like of today

As all other options relate to modern housing, we can conclude that the correct option is C.

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