Question

Which is the center dialation

Answer 1

C is the center of dilation. To find the center of dilation, we pick two points on the original figure and dilated figure respectively, and connect them with a line; we pick another pair of points, and connect them with a line. The intersection of the two lines is the center, which is C in this case.

Answer 2

The answer is point C

the attached figure shows an explanation of the answer
by connecting the corresponding vertices of triangles, it will intersect at point c