Final answer:
The portion size for broccoli is ½ cup, which is approximately equivalent to 4 ounces, making option a (4 oz) the closest answer.
Step-by-step explanation:
The portion size for broccoli according to the reference information provided is ½ cup. If we look at other items listed, such as green beans, lima beans, carrots, and cauliflower, they are also measured in half-cup servings. To answer the student's question specifically, none of the options (4 oz, 5 oz, 6 oz, or 7 oz) directly match since the measurement provided is in cups, not ounces. However, typically ½ cup of chopped vegetables like broccoli is approximately equivalent to 4 ounces by weight. Therefore, the closest answer to the question based on common conversion estimates would be option a. 4 oz.