Vector a Has a Magnitude of 3

Multiple Choice

Vector A has a magnitude of 3.0 units and makes an angle of −90.0º with the positive x-axis. Vector B has a magnitude of 4.0 units and makes an angle of −120º with the positive x-axis. What is the direction of the vector sum A + B relative to the positive x-axis?

A) −107º
B) 55º
C) −55º
D) −145º