The use of lime and costly burnt bricks, instead of sundried bricks

Q. The use of lime and costly burnt bricks, instead of sundried bricks, by the Indus Valley people for construction purposes is a proof of

(a) A moist climate on account of the close proximity of the civilization to the river valleys

(b) Advanced technology

(c) Better planning

(d) Knowledge of the manufacture of lime

Ans: (a) A moist climate on account of the close proximity of the civilization to the river valleys