In the question below choose the word(s) or phrase(s) which best fill(s) the gap(s):
A student’s natural ability should be a …. factor in his choosing a course  of study at the university.
    In the question below choose the word(s) or phrase(s) which best fill(s) the gap(s):
A student’s natural ability should be a …. factor in his choosing a course  of study at the university.