Children will more effectively develop the breakfast eating habit if
a. they are driven to school so that they have time to eat.
b. parents eat breakfast with them.
c. breakfast is prepared for them to eat while their parents are dressing for work.
d. they are given money to buy breakfast on the way to school.

I would choose  B. due to the fact someone is sitting there with them watching them eat as they eat as well.                                                                                in A. you have no clue if your kid will actually buy food even if there is  time.
in C. they could feed it to the dog or throw it away again you don't know due to no one else being their.
and in D. will they buy food? you don't know.

The answer would be a (carbohydrates)