The correct option is D a few players get injured on the field.
The passage is about a situation during the beginning of a game season, where a coach has to talk about his players to reporters. The given line "In spite of good players, a team may lose the game if..." needs to be completed by one of the options. Option D is the correct answer as it's mentioned in this line from the passage "overconfidence, injuries, an error on the field...may wreck any season". Option A is incorrect because this line is not backed up by the passage, no line in the passage suggests this idea. Similarly, options B and C are incorrect because this is not mentioned in the passage. The reasons mentioned for losing a game are, "overconfidence, injuries, error on the field, better luck of his opponent", apart from which there aren't any other reasons as mentioned in options A, B and C.