La calidad de vida de los indígenas se deterioró después de su conversión en esclavos.
The appropriate choice is C preparen since both statements refer to what 'ellos' will do, instead of focusing on themselves.
I need to get ham, bread... I can't recall anything else. Whenever I’m with you, Andrés, my memory fails me. ANDRÉS I apologize. Oh right, I remember. We also need to grab sausage and cheese for the appetizers. DAVID By the way, do you know who Alfredo is going to the party with? ANDRÉS I heard he invited Sara... but she’s refusing to go with him. She’s quite upset. DAVID Just between us, I think there’s tension between them. And you? Who’s your date? ANDRÉS Hmmm. I'm going with Sara... DAVID Ah! Is that so? I’m not sure. You should tread carefully, as it might be tough for Alfredo. Let’s get something nice for him.