Analyze the sentences below about the correct use or not of articles (

Analyze the sentences below about the correct use or not of articles (a, an, the or X (=no article)).

1. Kate has been talking to a customer who has just come into the shop.
2. She went to the zoo, but she didn’t see the monkeys there. She hates the monkeys.
3. People don’t write X letters nowadays. They write X emails. But I haven’t written an email for ages.
4. Jerry works in an university in the center of X London.

Select the option that presents the correct sentences.