Read the following article and select the best answer. Article: In the United States,boys and girls start school when they are five years old.In some states they must stay in school until they are sixteen.Most students are seventeen or eighteen years old when they graduate from secondary school.another name for high school.Most children go to public elementary and secondary schools .The parents of public pupils do not have to pay for their children's education because taxes support the public schools.If a child goes to a private school ,his parents have to pay for the child's education.Today about half of the high school students go on to colleges and universities .Some colleges and universities receive money support from the government .A student at a state university does not have to pay very much if his parents live in that state.Private schools are expensive,however.Almost half of the college students in the USA work while studying.If a student's family is not rich,he has to make money for part of his college expenses . Question: In the USA almost half of the college students work while studying.This is because _ . - their families aren't rich enough - they don't want to depend on their parents - they are interested in work - their parents don't live in that state
A:
they don't want to depend on their parents