Which of the Following Explains the Result of Type I

Multiple Choice

Which of the following explains the result of type I topoisomerase activity on underwound DNA, considering that no energy (ATP) is used in the reaction?

A) the linking number is decreased by 1
B) the linking number is increased by 1
C) the linking number remains the same but the twist decreases by 1
D) the linking number remains the same but the twist increases by 1
E) none of the above