To solve this problem it is necessary to apply the concepts related to the Period based on the length of its rope and gravity, mathematically it can be expressed as
[tex]T= 2\pi \sqrt{\frac{L}{g}}[/tex]
g = Gravity
L = Length
T = Period
Re-arrange to find the gravity we have
[tex]g = \frac{4\pi^2 L}{T^2}[/tex]
Our values are given as
[tex]L = 0.35m\\T = 2s\\[/tex]
Replacing we have
[tex]g = \frac{4\pi^2 L}{T^2}[/tex]
[tex]g = \frac{4\pi^2 0.35}{2^2}[/tex]
[tex]g = 3.45 m/s^2[/tex]
Therefore the correct answer is C.
