Three Forces F₁,F₂ and F₃ act on an Object

Multiple Choice

Three forces F₁,F₂ and F₃ act on an object.If F₁ = 3N i + 5N j + 7N k,F₂ = -5N i - 2N j -2N k,and the object is moving at constant velocity then the vector force F₃ is

A) -2N i - 3N j - 5N k
B) 2N i - 3N j - 5N k
C) 2N i + 3N j - 5N k
D) -8N i - 7N j - 9N k
E) 8N i + 7 N j +9N k