Answer:
C. Law of diminishing returns
Step-by-step explanation:
Diminishing marginal returns is when a manufacturing firm experiences reduced returns as production increases. According to the theory of diminishing marginal return, a business experiences increased returns with the added inputs until it reaches its maximum production capacity. Additions inputs will not results in more output as production has already reached its peak.
Deploying additional inputs will result in reduced profitability. Inputs are a cost to a business. The additional expenses are not resulting in extra income as output is not increasing. The manufacturing firm was experiencing reduced profits per item because costs were increasing, but income was constant.