Question

The formula for finding the perimeter of a rectangle with length, l, and width, w, is P = 2l + 2w.

Answer 1

P1=2(l+w)---->(equation 1)
after the length and the width are doubled 
p2=2(2l+2w)
we will take 2 common factor out of the bracket
p2=2(2(l+w))
then from equation1
p2=2p1
then the answer is the choice number c

Answer 2

The perimeter will grow by a factor of 2, so C is the correct answer.