A Mass Is Suspended from a String in an Airplane $\degree$

Multiple Choice

A mass is suspended from a string in an airplane. As the plane is in the process of taking off, it is found that the string, instead of being vertical, hangs at an angle of 13 $\degree$ from the vertical. What is the acceleration of the plane at this time?

A) 2.3 m/s²
B) 3.8 m/s²
C) 9.1 m/s²
D) 3.5 m/s²