這句英文應該怎麼改?

Question

Because they were compelled to volunteer by their compassionate hearts.
這句該怎麼改,才較適當,因為感覺這句怪怪的

Answer 1

due to their compassionate hearts, they were compelled to volunteer.

Answer 2

Because they were full of compassion, and then they were compelled to be a volunteer.

Answer 3

agree with jeffery lowe

Answer 4

They were compelled to volunteer by their compassionate hearts.
Why use "because" or "due to"?

Answer 5

Because of their compassionate hearts, they were compelled to volunteer.
due to是比較反面ㄉ辭吧...|||