Assertion,
A judo fighter in order to throw his opponent on to the mat tries to initially bend his opponent and then rotate him around his hip.
Reason,
As the mass of the opponent is brought closer to the fighter’s hip, the force required to throw the opponent is reduced.
(A) Both Assertion and reason are correct and reason is the correct explanation for assertion,
(B) Both Assertion and reason are correct but reason is not the correct explanation for assertion
(C) Assertion is correct but Reason is incorrect
(D) Assertion is incorrect but Reason is correct

Hint: The moment of inertia, known as the mass moment of inertia, angular mass or rotational inertia, angular mass or rotational inertia, of a rigid body is a quantity that determines the torque needed for a desired angular acceleration about a rotational axis. Similar to how mass determines the force needed for the desired acceleration.

Complete answer:
When mass of the opponent is brought near by his moment of inertia gets reduced which makes the operation of will rotating him around the hip an easier exercise. Moment of inertia of a rigid body about an axis of rotation is defined as the sum of the product of the mass of each particle and the square of its perpendicular distance from the axis of rotation.
Therefore, the correct option (A) Both Assertion and reason are correct and reason is the correct explanation for assertion,

So, the correct answer is “Option A”.

Note:
Newton’s first law of motion, sometimes referred to as the law of inertia. An object at the rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. Rotational inertia is important in almost all physics problems that involve mass in rotational motion. It is used to calculate angular momentum and allows us to explain how rotational motion changes when the distribution of mass changes.