What changes when gravity becomes weaker?

A small-angle pendulum has period T in a laboratory where gravitational acceleration is g. The same pendulum is taken to a location where gravity is g/4.

What is its new period?

Organize the givens & assumptions

Length unchanged
Initial gravity: g
New gravity: g/4

Same length, negligible drag, small oscillation angles at both locations, ideal point bob and light inextensible string.

A $T/2$
B $T$
C $2T$
D $4T$

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