The correct answer is D. MR curve depends upon the elasticity of AR curve.
In imperfect competition, firms have some market power, which means they can charge a price above marginal cost. This results in a downward-sloping demand curve, and the marginal revenue curve lies below the demand curve. The elasticity of the demand curve determines how much the firm can raise its price without losing too many customers. If the demand curve is very elastic, the firm will not be able to raise its price very much, and the marginal revenue curve will be close to the demand curve. If the demand curve is very inelastic, the firm will be able to raise its price a lot, and the marginal revenue curve will be far below the demand curve.
Here is a diagram that illustrates the relationship between the demand curve, marginal revenue curve, and marginal cost curve for a firm in imperfect competition:
[Diagram of a firm in imperfect competition]
The demand curve is downward-sloping, the marginal revenue curve is below the demand curve, and the marginal cost curve intersects the marginal revenue curve at the point where the firm produces the profit-maximizing output level.
I hope this explanation is helpful! Let me know if you have any other questions.