the point at which it is no longer advantageous to buy in bulk is known as marginal cost. tipping. benefit…

Brief Explanations:

In economics, marginal cost is the cost of producing one more unit or in the context of buying, the additional cost of buying one more unit. When the marginal cost of buying in - bulk exceeds the marginal benefit, it is no longer advantageous to buy in bulk. Tipping is related to service industry gratuity, benefit is a general positive outcome but not the specific term here, and error is not relevant in this context.

Answer:

A. cost