Explanation:

Correct Answer is (b).The given statement explains that two boys were asked about the stale fruits but they did not buy anything from the market and that is why they were not able to give any answer regarding this.
In the first bold part of the sentence, the error lies in the fact that in case of two things, every is not used but each is used and therefore, every of the two boys is not correct usage in this part of the sentence. Regarding the second part of the sentence, some is used in order to indicate something in affirmative whereas any is used so that something negative may be expressed. In this context, the term some / any is used in the negative sense of the term and therefore, it is not correct. It should have been did not buy any fruits. 
The correct sentence would be: Each of the two boys was asked about the stale fruits but they did not buy any fruits from the market.
This makes option B the correct choice among the given options.