A Simple Pendulum Having a Bob of Mass M Has $\sqrt { 2 }$

Multiple Choice

A simple pendulum having a bob of mass M has a period T.If you double M but change nothing else,what would be the new period?

A) 2T
B) T $\sqrt { 2 }$
C) T
D) T/ $\sqrt { 2 }$
E) T/2