Answer:
D. they may no longer be able to specialize, and total output will decrease.
Step-by-step explanation:
When successive workers are added to a production process the law of diminishing returns sets in. The law of diminishing returns states that as more input is added in the production process there is a point at which the marginal output will begin to decease. When law of diminishing returns sets in, effectiveness of added input decreases.
So in this scenario when additional labour is added at a point the output will begin to decrease.