Q: In extremely poor societies, children can be put to work ____ a young age and are therefore a source of income.
(a)in
(b)on
(c)by
(d)at
Correct Answer: (b)
The correct answer is (a): in. Subject: English Language | Sub-topic: Grammar & Vocabulary Note: This answer was determined through AI-based research. Verify against the official answer key when available.