D. The librarians ... 1) Like Mark and always treat him with something tasty. 2) Don't like children at the library. 3) Like reading and read in comfort.

Решение:

В тексте сказано: «The librarians already know Mark and always greet him cheerfully and give him something tasty to eat on his way home».

Ответ: 1) Like Mark and always treat him with something tasty.