Which of the following best describes the graphs below?

a. triangle a is similar to triangle b by dilating triangle a by a scale factor of 2 with the center of dilation at the origin and reflecting it across the y-axis.

b. triangle a is congruent to triangle b by dilating triangle a by a scale factor of with the center of dilation at the origin and reflecting it across the y-axis.

c. triangle a is similar to triangle b by dilating triangle a by a scale factor of with the center of dilation at the origin and reflecting it across the x-axis.

d. triangle a is neither similar nor congruent to triangle b.