Why is circle 1 similar to circle 2?

Question

Suppose x c is any positive number. Circle 1 has a center at (- 2, 7) and a radius of 8x. Circle 2 has a center at (-3, 0) and radius of 5x.

Why is circle 1 similar to circle 2? 

A. Circle 1 is a translation of one unit right and seven units up from circle 2 and a dialation dislocation of circle 2 with a scale factor of 1.6.

B. Circle 1 and circle 2 have the same circumference, and circle 1 has a radius 1.6 times the length of a circle 2's radius.

C. Circle 1 is a transaction of one unit right and seven units up from circle 2 and a dialation of circle with a scale factor of 0.625.

D. Circle 1 and circle 2 have the same area, and circle 1 has a radius 0.625 times longer than circle 2 

Answer 1

they dont have the same circumference so b) is wrong

look at a, b and d and see if any are also saying something incorrect

they don't have the same area, so d) is out

you're down to a) or c) both are correct on all except they differ on the dilation factor

a) seems to say circle 1 is dilated to get circle 2, so it's the "best" answer

regardless whether all circles are similar as other evasive tutors prefer to say