Which of the following best describes one serving of fruit?
1 small apple
a bunch of grapes
2 oranges
1/1/12 medium bananas

A serving of fruit is best described as a small Apple.

A bunch of grapes is not specific enough; grapes need to be counted for serving size.

2 oranges is too much; 1 Orange is an appropriate serving size.

And bananas...
1 small or 1/2 of a large banana.