According to the rule of phrasal verbs, The detective has B. ruled out the possibility of foul play, which is the correct answer.
This is known as a phrase that combines a verb with a preposistion or adverb or both.
Hence, we can see that based on the rule of a phrasal verb, ruled out means to eliminate or to make impossible.
Therefore, The detective has ruled out the possibility of foul play" is the correct answer.
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