Answer:
C
Step-by-step explanation:
A combination of different vegetables
A is a flavor base made from cooked, diced vegetables (onions, celery and carrots mainly), usually with butter, oil, or other fat, for a long time on a low heat without coloring or browning, as further cooking, often with the addition of tomato purée, creates a darkened brown mixture called pincage (French: pinçage). The intention is to sweeten the ingredients rather than caramelize them. It is a long-standing cooking technique in French cuisine.