Answer:
The correct answers are:
a) Children cannot attend school.
b) Children may find it hard to improve their economic  situation.
Explanation:
While child labor was common throughout the world, it was systemically banned in order to provide a better living for children.
As early as only a 200 years ago, it was common in many countries to employ children as young as 6 to work in coal mines, farms etc and pay them much less than an adult.
However, it was realized that for a modern society to work, education was very important and children working 12-16 hours a day could not take part in it.
A poor education would most likely mean that a child might stay in poverty and their social mobility might be constrained.
Today, most countries in the world have completely banned child labor and make it mandatory for them take an education.
