The correct answer is A. The best affordable point.
A budget line is a line that shows all the combinations of goods that a consumer can afford with a given amount of money. An indifference curve is a curve that shows all the combinations of goods that a consumer is indifferent between.
When the budget line is just touching an indifference curve at one point, it means that the consumer is at the best affordable point. This is because the consumer can’t afford any other combination of goods that would make them better off.
Option B is incorrect because the budget line can touch an indifference curve at multiple points. Option C is incorrect because the consumer can afford to be on a higher indifference curve.