What was the MAIN reason the position of lieutenant governor was created?

Responses
A to have someone to rule over the state senateto have someone to rule over the state senate
B to decide whether or not the governor is fit for dutyto decide whether or not the governor is fit for duty
C to appoint someone to ensure that the governor is acting fairlyto appoint someone to ensure that the governor is acting fairly
D to solve the problem of succession if the governorship is vacant

D to solve the problem of succession if the governorship is vacant