15. He was concerned about the condition of factory and mine workers while they were at work,
the _____ nature of making a living through such work, and the effects of the factory system on the family
life of workers.
(A) capricious (B) vicarious (C) precarious (D) vivacious
(A) capricious-sudden behavior change (B) vicarious-experienced sth by others instead doing it yourself (C) precarious-in a dangerous state because of not being safe/ firmly place (D) vivacious-energetic