According to the law of variable proportions, the marginal product of an input initially rises and then after a certain level of employment, it starts falling. The MP curve therefore looks like:

Inverse 'U' Shaped.

The correct answer is Option (4) → Inverse 'U' Shaped.

According to the law of variable proportions, the marginal product of an input initially rises and then after a certain level of employment, it starts falling. The MP curve therefore, looks like an inverse ‘U’-shaped curve .