Asection of a genome is cut with three enzymes: a, b, and c. cutting with a and b yields a 10-kb fragment. cutting with b and c yields a 2-kb fragment. what is the expected result from a digest with a and c, if the c site lies in between the a and b sites?

8-kb

Explanation:

As you can see in the picture attached, the cutting sites are consecutively situated in the genome. For that reason, if the largest fragment results when A and B cut, and the cutting site of C is betwen A and B, then the fragment expected from a digest with A and C could be calculated as follows:

looks like the answer is     c     to me!