Why did manufacturers hire children to work in their factories?
a - factory owners could pay children less money than they paid adults.
b -children were able to complete more work than adults.
c -children could work for eight hours per day.
d -factory owners expected children to do demanding physical labor.

A - Factory owners could pay children less money than they paid adults.  

Explanation:

Whenever a business/production line proprietor can lessen his/her expense with respect to paying laborers, they will take. This is the situation with children laborers. Not paying these youngsters indistinguishable wages from grown-ups enable the processing plant proprietors to keep more money for themselves or they can utilize that capital for other expenses.

A - Factory owners could pay children less money than they paid adults.  

Explanation:

Whenever a business/production line proprietor can lessen his/her expense with respect to paying laborers, they will take. This is the situation with children laborers. Not paying these youngsters indistinguishable wages from grown-ups enable the processing plant proprietors to keep more money for themselves or they can utilize that capital for other expenses.