The marginal benefit curve is:
a. upsloping because of increasing marginal opportunity costs.
b. upsloping because successive units of a specific product yield less and less extra benefit.
c. downsloping because of increasing marginal opportunity costs.
d. downsloping because successive units of a specific product yield less and less extra benefit.

D. downsloping because successive units of a specific product yield less and less extra benefit.

Explanation:

This has to do with diminishing marginal productivity which causes that marginal costs to increase.

In true, close to 0 production, marginal costs decrease and marginal benefit curve increases. But because of diminishing marginal productivity, it (marginal costs curve) soons reaches a min and start increasing, which causes the marginal benefit curve to decrease

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