Final answer:
An English muffin closely matches the requirement of approximately 15 grams of carbohydrates, as a single slice of whole grain bread contains about the same amount.
Step-by-step explanation:
Among the options listed, 1 English muffin is likely to contain approximately 15 grams of carbohydrates. Whole grain breads, similar to English muffins, are a good source of complex carbohydrates, with a single slice typically containing about 15 grams. Fruits such as bananas are also rich in carbohydrates; however, a large banana usually has more than 15 grams, typically around 27-30 grams. Popcorn, which is a whole grain, can be high in carbohydrates as well, but 4 cups of popped popcorn generally contain about 30 grams of carbohydrates, which is double the amount we are looking for. Lastly, potatoes are well-known for their starch content, and 1/2 cup of mashed potato would roughly consist of 15-17 grams of carbohydrates, making it a close match to the desired amount.