Answer:
A a decrease in the amount of money they receive
Step-by-step explanation:
If the seller levies the tax on the customer, the tax will increase the price of a product and in turn decrease the demand for the product. Decreased demand, in turn, will reduce the total revenue.
But if the seller levies the tax on themself, it will not increase the product price but lower the seller revenue directly. Either way, the revenue of the seller will be decreased.