I went to my mom 's for a couple of days . With school starting in a couple of weeks , I probably wo n't have occasion to do that any time soon . She has this beautiful jade that has been feeling the effects of a mealybug infestation . She treated it a couple of weeks ago , but they are practically as bad now as they were prior to treatment .

Available options: a. Their mother does n't live close so they 've have to miss class to visit her .. b. Students were required to complete their studies before they were allowed to leave the school .. c. None of the above choices .. d. The school does n't allow students to leave the campus during class ..
Q: Why would school stop the narrator from visiting their mom ?
a.