HE HAD TO EARN HIS LIVING BY WORKING AS A PORTER WHEN HE WAS 15A. I...

3. He had to earn his living by working as a porter when he was 15

A. It was 15 when he had to earn his living by working as a porter

B. It was working as a porter by that he had to earn his living when he was 15

C. It was when he was 15 that he had to earn his living by working as a porter

D. It was a porter that when he was 15 he had to earn his living by working