A. Anna's parents didn't want to have a pet because ... 1) it was difficult to look after it. 2) they lived in a little house. 3) their daughter was unkind.

В тексте сказано: «Her mum and dad didn't want a pet because it was a lot of work» (Мама и папа не хотели питомца, потому что это было много работы).

Ответ: 1) it was difficult to look after it. (это было сложно смотреть за этим)