What Does the Ratio Test Tell Us About the Series $\sum_{n=1}^{\infty} \frac{n}{2^{n}}$

Multiple Choice

What does the ratio test tell us about the series $\sum_{n=1}^{\infty} \frac{n}{2^{n}}$ ?

A) The series converges.
B) The series diverges.
C) The ratio test doesn't tell us anything about the convergence of the series.