Problem:

Question: Which of the following best describes the mechanism by which chromatin-remodeling complexes "loosen" the DNA wrapped around the core histones?

A.They use energy derived from ATP hydrolysis to change the relative position of the DNA and the core histone octamer.

B.They chemically modify the DNA, changing the affinity between the histone octamer and the DNA.

C.They remove histone H1 from the linker DNA adjacent to the core histone octamer.

D.They chemically modify core histones to alter the affinity between the histone octamer and the DNA.

Please select correct answer and also provide explaination.