Dr. quinones studies the achievement motivation of junior high school students. he asserts that such motivation mainly reflects the parenting and educational practices the students have experienced. this statement is most directly related to the issue; dr. quinones' position is toward the end of the continuum.

The correct answer is - nature vs. nurture and nurture.

Explanation:

Nature and nurture is the debate about the discussion for the proper reason behind human behavior if it depends on nurture which means environmental conditions or social condition, or depends on nature which means the genetic or hormonal based traits.

Dr. Quinones studies about nature and nurture related issue, however, his position is towards the nurture instead of nature.

Thus, the correct answer - nature vs. nurture and nurture.