An athlete who is both the best football and baseball player on their High School team is said to have a  (a) Absolute advantage in both sports.
Explanation:
The athlete who is simultaneously the best player in both the teams of the baseball and the football team is a gifted athlete with a lot of skills that help him be his best in the sports which are widely different.
Both the sports however are basically based around core strength and perseverance which he seems to have aplenty in his body to be the best of the both teams in the both sports. Hence he can be said to have an absolute advantage over his peers in both the sports he plays.
