which answer contains a proper in text citation A according to Middlebrook swimming is unlike other sports because it uses several different muscles groups Middlebrook 55, B swimming is unlike other sports because it uses several different muscles groups say Middlebrook, C swimming is unlike other sports because it uses several different muscles groups Middlebrook55, D according to Middlebrook swimming is unlike other sports because it uses several different muscles groups 55

The answer that contains a proper in-text citation is A: "according to Middlebrook swimming is unlike other sports because it uses several different muscles groups Middlebrook 55."

However, note that the citation is not entirely correct; it should either include proper punctuation (e.g., a comma before "according to") or use a format that properly integrates the citation (e.g., "According to Middlebrook, swimming is unlike other sports because it uses several different muscle groups (55)."). Nonetheless, option A is the closest to a proper citation out of the options provided.