Read the following statements - Assertion (A) and Reason (R): Assertion: Any factor that affects a firm's marginal cost curve is of course a determinant of its supply curve. Reasoning: A firm's supply curve is a part of its marginal cost curve. From the given alternatives choose the correct one:

Both Assertion (A) and Reason (R) are true and Reason (R) is not the correct explanation of Assertion (A). Assertion (A) is true but Reason (R) is false. Assertion (A) is false but Reason (R) is true. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

Since a firm’s supply curve is a part of its marginal cost curve, any factor that affects a firm’s marginal cost curve is of course a determinant of its supply curve.