Which of the following best describes the graphs below?

a.
pentagon a is congruent to pentagon b by dilating pentagon a by a scale factor of 3 with the center of dilation at the origin and translating it 2 units right and 6 units up.
b.
pentagon a is neither similar nor congruent to pentagon b.
c.
pentagon a is similar to pentagon b by dilating pentagon a by a scale factor of 2 with the center of dilation at the origin and translating it 3 units right and 6 units up.
d.
pentagon a is similar to pentagon b by dilating pentagon a by a scale factor of with the center of dilation at the origin and translating it 6 units right and 3 units up.