Final answer:
The correct completion of the conversation between Margarita and Isabel is option A, because Isabel likes sweets.
Step-by-step explanation:
The correct completion of the conversation between Margarita and Isabel is:
Isabel: No, pero como la leche nevada y la torta de chocolate.
The sentence that completes the conversation is option A: "porque me gustan mucho los dulces" which means "because I really like sweets". This response is appropriate because it explains why Isabel prefers to eat sweets instead of vegetables.
Learn more about Completing a conversation in Spanish