The correct answer describes Newton's second law of motion : A. Force = mass x acceleration (F=m.a)
Newton's 2nd law states that :
the acceleration from the applied force is proportional to the resultant force and inversely proportional to the mass
Can be formulated
[tex]\tt a=\dfrac{F}{m}[/tex]
or
[tex]\tt F=m\times a[/tex]
F = force, N
m = mass, kg
a = acceleration, m/s²