More than a thousand years ago, Al-Biruni recorded several observations about India. Which of the following were mentioned by him?
A. Indians were skilled at making ponds B. Horses were used to pull carts C. Step-wells had separate steps for going up and coming down D. Lakes and johads were built to collect water
Choose the correct option:

Correct option is C

Correct Answer: (c) A and C
Explanation:
Al-Biruni specifically wrote about:
• Indians being highly skilled in constructing ponds and tanks for water storage • Step-wells having separate stairways for people going up and down
He did not mention johads (traditional rainwater structures became prominent later in medieval Rajasthan records).
Additional Information:
• Al-Biruni’s writings focused on scientific and engineering skills of Indians • Step-wells were a major architectural innovation • Johads are later traditional rainwater harvesting systems