Which of the following items is a good cue for estimating a portion size equal to one cup?

a. spoonful
b. baseball
c. golf ball
d. six dice

One cup of food is equivalent to an estimated weight of a baseball.

Option B

A healthy diet is very essential for maintaining the body healthy as well as fit. The body weight also depends a lot on the amount of daily food intake and also the quality of food that the person consumes on a large scale. This quantification of food is often done by comparing a the weight of correct amounts of food with many household objects that a person uses almost daily, to give the person an idea of how much food intake is enough for a healthy living.

Thus, computer mouse, gold ball, tennis ball, base ball, dice all examples are used.  Weight of a cup of food is basically dependent on the food's overall density. But a general estimation suggests that one cup of food weighs around the weigh of a baseball.