Answer:
a. how often children misbehave in school
Explanation:
Here, it being studied whether the number of times the children eat together with their families affects the child's behavior at school.
So, one variable is the number of times the children eat together with their families and the other variable is the behavior of the child at school.
The variable which changes irrespective of the other variable is called the independent variable.
The variable which changes with respect to the independent variable is the dependent variable.
Hence, how often children misbehave in school is the dependent variable and the number of times the children eat together with their families is the independent variable.