How did the building of granaries indicate that Harappan civilization was economically strong?

A. It showed that the richest Harappan citizens had excess food to trade or sell.
B. It showed that Harappa could store excess food to save, sell, or trade with others.
C. It showed that Harappa could tax farmers by taking their excess crops as payment.
D. It showed that the richest Harappan citizens were capable of planning for times of drought.

53/100 !

sorry? idk what i'm supposed to exain and i might

i believe that if you say you can, you cant and if you say you can't your right. i believe i can do anything i set my mind to. i've applied this with my everyday life. it me get motivated to do stuff.for example, i apply this to do school. if i believe i can finish a whole class in a couple of week's i will be motivated to do the class until i finish it, and if i believe i can't, i will get distracted and do other stuff besides doing my work. it changed me by believing i can accomplish anything i set my mind to.