Respuesta :
Answer D. Become President if necessary.
In case the President of the United States is unable to perform his duty, the Vice-President's most important responsability is to be ready to assume the presidency. There can be many reasons for this: Impeachment, President's death, resignation or temporary incapacitation. He also serves as President of the United States Senade.
The responsibility of the Vice President is to become president if necessary.
Who is the Vice President?
The Vice President of the United States has several roles and functions such as being the head of the Senate.
Their main role however, is to stand in and become president in case the President is unable to carry out their duties in an adequate manner.
In conclusion, option D is correct.
Find out more on the Vice President at https://brainly.com/question/15895219.