Which of the following situations involves a person who best illustrates the meaning of persistence?

A. A soccer player scores a goal with a kick that carries the ball from one end of the field to the other.
B. A football player is injured on the field while tackling someone from the opposing team.
C. A baseball player scores a home run in the last inning, winning the game for his team.
D. A runner trains four days a week for a year, improving her speed and stamina.