Answer: A. two; majority of popular vote
Explanation:
I am unsure as to what state is being referred to but generally speaking, governors in the United States can only serve two consecutive terms and have to be elected by majority vote.
This ensures that the person that is most supported by the people of the state will be put in charge of the affairs of the state but also ensures that they will not be there so long that they will impede the positive change that can come with the different perspective of another governor.