Charlie's utility function is U(A, B) = AB, where A and B are the numbers of apples and bananas, respectively, that he consumes.If Charlie is consuming 40 apples and 160 bananas, then if we put apples on the horizontal axis and bananas on the vertical axis, the slope of his indifference curve at his current consumption is

A) -4.
B) -8.
C) -41.
D) -1/4.
E) -1/8.

Utility Function

Represents a consumer's preference ranking for various bundles of goods, articulating the level of satisfaction received.

Indifference Curve

An indifference curve represents a graph showing different combinations of two goods that provide the consumer with the same level of satisfaction or utility.

Apples

A common fruit that is edible, coming in various varieties and used both for eating raw and in cooking.