[tex]T[/tex] is the pendulum's period/time it takes for it to complete a full swing and [tex]L[/tex] is its length. So
[tex]3.27\,\mathrm s=2\pi\sqrt{\dfrac{1\,\mathrm m}{g_{\rm Mars}}}\implies g_{\rm Mars}\approx3.69\,\dfrac{\rm m}{\mathrm s^2}[/tex]
and the closest answer is B.
