A 030-Kg Mass Attached to the End of a String Swings

Multiple Choice

A 0.30-kg mass attached to the end of a string swings in a vertical circle (R = 1.6 m) ,as shown.At an instant when $\theta$ = 50 $\degree$ ,the tension in the string is 8.0 N.What is the magnitude of the resultant force on the mass at this instant?

A) 5.6 N
B) 6.0 N
C) 6.5 N
D) 5.1 N
E) 2.2 N