Answer:
The right answer is, A. Coman.
* La tía les aconseja a los primos que no coman mucho pastel.
Step-by-step explanation:
Because in the answer options the verb "to eat" is being conjugated therefore, we must identify the number of the person within the sentences, their gender and number to be able to correctly conjugate the verb within the context and that it agrees with what is expressing itself.