Which attribute is not an element of giving one's best effort?
a. setting aside personal issues while competing
b. always putting forth a maximum effort
c. letting the other team score easily
d. being mentally focused during the game

An element which does not attribute to one’s best effort is letter C: letting the other team score easily. Because in this case, you are not defending your team and just let the other team grab the chance of winning  in a competition. When you are on a game, all your attention and effort must be there to ensure that you will have no regrets after the game.