momentum of object is defined as the product of mass and velocity of the object.
so we have
![P = mv](https://img.qammunity.org/2020/formulas/physics/high-school/sf82jq0v1hccf3tbythbvi54tvskpd6rhs.png)
While impulse is the change in momentum of object
so we can say
![Impulse = m(v_f - v_i)](https://img.qammunity.org/2020/formulas/physics/high-school/e99x9tt9rzf11ljnqpdtt1rakqtupg5uje.png)
so here we have correct answer as
The impulse acting on and object is equal to the change of momentum it causes.