The purpose of the 25th amendment is to
a. legally state that the vice president shall become president upon vacancy of that office
b. limit the vice president’s number of terms
c. define the order of succession following the vice president
d. define the vice president’s duties

The correct answer is:
a. legally state that the vice president shall become president upon vacancy of that office

Let's look at the first section of this Amendment:
"In case of the removal of the President from office or of his death or resignation, the Vice President shall become President."
-this clearly states that the purpose of the 25th Amendment is to establish that if the President can't fulfill his duties, this role is take up by the Vice-President. 

Sometimes but itt depends, their is a lot if drugs on campus too so you really can't just say that