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Why is circle 1 similar to circle 2?

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 

Comments

All circles are similar - that have the same shape yet possible difference size. The problem is a lot of busy work. None of the answers have anything to do with the definition of "similar."
Mark, excellent answer--I suggest that you promote it from Comment to Answer (by cut-and-paste).

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