The second law of motion gives the measure of which of the following?
(a) Force
(b) Acceleration
(c) Momentum
(d) Angular Momentum
Why the answer is force and not momentum ? 

Solution : 

Newtons Second law of motion states that the force F acting on a body of mass m producing acceleration a is equal to the product of the mass and acceleration of the body.
​​​​​i.e.
F = ma

The rate of change in momentum is directly proportional to the force applied and it is in the same direction of the applied force.
Hence, the correct option is (a) Force.
Momentum is defined as the product of the mass of an object and velocity. And it's given by
p = mv