Answer:
Option 3.
Step-by-step explanation:
It clearly states in this option that his motivation for studying is his love of math. On the other hand, options 1 and 2 tell us that he is working towards things like football tryouts. Option 4 clearly tells us he is determined. The difference between options 1 and 4 is that option 1 does not clearly state he is motivated to reach a goal, unlike option 4. Hope this helped! :)