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Math·Geometry and Trigonometry·Lines, angles, and triangles

easy

In triangle $RST$, the length of $\overline{RS}$ is 6, and the length of $\overline{ST}$ is 12. Triangle $RST$ is dilated by a scale factor of $\frac{1}{3}$ to obtain triangle $R^{\prime }{S}^{\prime }{T}^{\prime }$. What is the length of $\overline{S^{\prime }{T}^{\prime }}$?

A

2

B

4

C

18

D

36