4 Lawrence talked to the elephants a lot because ...

• A he loved talking to animals.
• B he wanted them to stay in the wildlife park.
• C it helped him to relax.

Обоснование: В тексте сказано: "Lawrence spent two weeks living with the group. He talked to them for hours. Slowly, the elephants became relaxed and after that, they stayed." Действие, приводящее к расслаблению слонов, также подразумевает, что это помогало и ему.