You Are Working Late in the Physics Lab, Where You

You are working late in the physics lab, where you measure the period of a pendulum to be 0.8 s. You fall asleep and have a dream that you are on a planet whose gravitational strength is 4 times that of the earth. If your dream is to be physically accurate, the period of the pendulum in your dream must be

A) 0.8 s.
B) 0.4 s.
C) 1.6 s.
D) 3.2 s.