Who are some of the successful coaches in the sport? What makes them successful? What are some of their techniques?

Casey Stengel is one of most successful coaches in a sport.

Explanation:

What made Casey Stengel successful was he won the starting center fielder job. The Dodgers had a new ballpark, and Stengel became the first person to hit a home run there, first an inside-the-park home run against the New York Yankees in an exhibition game to open the stadium, and then in the regular season.

i think the answer is strength

out of the choices i'd say d the ability to set goals, mainly because to desire to continue you need motivation but it isn't motivation in that part, but setting goals means you have an endgame and you want to reach it which sums up motivation.