HELP!!! ANYONE WHO'S GOOD AT GEOMETRY PLEASE HELP T_T

In the diagram, △ABC∼△PQR, mAB¯¯¯¯¯¯¯¯=2, and mPQ¯¯¯¯¯¯¯¯=5.

If the perimeter of ΔABC is 3x, what is the perimeter of △PQR?

A. 3/2x

B. 7.5/5x

C. 6x

D. 15/2x