The correct answer is A. Convex.
An indifference curve is a graph showing combinations of goods that provide the same level of satisfaction to a consumer. Indifference curves are usually drawn as convex curves, meaning that they are bowed inward towards the origin. This is because consumers generally prefer to have more of both goods, rather than just one or the other.
If an indifference curve were concave, it would mean that consumers would be indifferent between having a lot of one good and a little of the other.
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