A force F₁ =  3.2 N pushes on a box with mass m = 8.4 kg from the east.  A second force, F₂ = 5 N pushes on the box from the South.  Determine the magnitude of the acceleration on the box.

a. 0.71 m/s2

b. 0.98 m/s2

c. 4.20 m/s2

d. 12.3 m/s2

e. None of the other answers are correct