1.

Please let me know the answer,Step by Step explanation please.

Answer»

Step-by-step EXPLANATION:

Within' means on the inside, which is not possible in this sentence. It is difficult to hide when 'on' a tree. So, option B is ALSO ruled out. 'In' would indicate that there is some place which leads to the inner part of the tree like a hole. But since nothing as such is MENTIONED in the sentence, the RIGHT ANSWER is 'behind'.



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