Question

How many square inches are there in a square yard? A) 36 B) 72 C) 1,296 D) 46,656

Answer 1

You know that

1 yard = 36 inches.

Moreover,  

1 square yard =1 yard × 1 yard

Then

1 square yard = 36 inches × 36 inches = 1,296 square inches.

Answer: correct choice is C.