B. Anna started to feed animals for people because ... 1) her parents decided to buy her a pet. 2) she wanted to show her parents she could look after a pet. 3) her parents asked her to do it

В тексте сказано: «But Anna wanted to show she could take care of a dog.» (Но Анна хотела показать, что может заботиться о собаке).

Ответ: 2) she wanted to show her parents she could look after a pet. (она хотела показать родителям, что может заботиться о питомце)