Final answer:
Mirepoix is typically made with a 2:1:1 ratio of vegetables, meaning 8 ounces of onions, 4 ounces of carrots, and 4 ounces of celery is correct.
Step-by-step explanation:
The typical portions for making 1 pound of mirepoix are 8 ounces of onions, 4 ounces of carrots, and 4 ounces of celery. This ratio can be remembered by the classic 2:1:1 ratio representing two parts onions to one part carrots and one part celery. Therefore, the correct answer is c. 8 ounces onion, 4 ounces carrots, 4 ounces celery.