Question

​if you were advising a friend on the benefits or harms of allowing her young children to watch television, you would be most correct if you informed her that the most important factor in this question is

Answer 1

The most important factor would be: The content of the programs that children watch. Some televisions indeed contain violence and vulgarities that might harm the children's development.
But some programs are actually educational and would help the children in their intellectual development.