Time period of a simple pendulum is measured at karachi, what change will occur in the time period ,if it is measured on mount everest

The time period will increase as you go higher, I believe. I hope it's right.

Time period t = 2pi root (l/g) g is acceleration of gravity. As you go up, gravity acceleration is reduced (inverse square law of Newtonian gravity).  so, the time period should increase. As the other answerer has answered.

Ithink your answer is d