The sentence uses the word 'every' is used before the subject i.e boy indicates the singularity of the verb. Therefore, the correct word is option C) has. Option A) does is an auxiliary verb but incorrect to be used in the context of the sentence as you cannot 'do' books, pens and pencils. Option B) have and option D) are are used in case of more than one subject or object.  Hence they are incorrect.