It is a period of 10 years.
I think the answer will be B
That would be a professor it sounds cliche but that's how it is. when you go to most colleges you won't have the same teacher every single day they travel around from time to time that's why they're called professors.
Well, an obvious reason why children went to work during the Industrial revolution despite the conditions for work being horrible is the simple fact that families couldn't afford to survive in a lot of cases if it weren't for their children who would work as well. It was done out of necessity not out of pleasure.
