Final answer:
One ounce of grains is roughly equivalent to one slice of bread or half a cup of cooked rice or pasta. Based on the options provided and common serving sizes, one-half cup of cooked rice would likely be the closest to one ounce of grains.
Step-by-step explanation:
The question asks which option represents one ounce of grains. According to healthy eating guidelines, it is important to make at least half your daily grain choices whole grains such as whole wheat bread, brown rice, and whole grain oats. Since the actual sizes of the items listed in the question can vary, it is generally accepted that one ounce of grains is equivalent to about one slice of bread or half a cup of cooked rice or pasta. Therefore, the closest option to represent one ounce of grains would likely be:
a. One-half cup of cooked rice
However, this can depend on the specific size of the muffin, the density of the oatmeal, or the size of the rolls. Always read food labels for specific serving sizes to ensure accurate measurements.