George clinton, the governor of new york for many years, served as vice president under thomas jefferson, and [again under james madison, to become only one of] two men to serve as vice-president under two different us presidents.

a. again under james madison, to become only one of
b. served again under james madison, to become one of only
c. again under james madison, becoming one of only
d. served again under james madison, becoming only one of
e. he served as vice president again under james madison, becoming only one of

I would choose letter C instead of letter A.

C. again under James Madison, becoming one of only

Explanation:

We must choose the best way to complete the sentence:

George Clinton, the governor of New York for many years, served as Vice President under Thomas Jefferson, andtwo men to serve as Vice-President under two different US Presidents.

First, there is no need to repeat the subject or the verb. We know the sentence keeps on talking about the same topic, George Clinton. And, since we are about to mention the two presidents he served as Vice President under, we don't need to use the verb "served" again. Once is enough to include both times. Also, we must be careful where we place the word "only", since it can change the meaning of the sentence. If we say he became "only one" of two men, it sounds as if we are diminishing his importance. If we say the became one of "only two men", we are doing the opposite. There were only two men to serve as Vice President under two different US Presidents. Being one of them is a great deal. That's why I believe letter C to be the best choice:

George Clinton, the governor of New York for many years, served as Vice President under Thomas Jefferson, and again under James Madison, becoming one of only two men to serve as Vice-President under two different US Presidents.

either a donut or a sphere or a pancake or a flat sphere. it depends on where the vertical line is.

if the line goes through the center of the circle and is perpendicular to a diameter containing the center, then you get a flat circle.

if the line and the diameter of a the circle meet in the center of the diameter and at an angle, you get a pancake.

if the line is on the circumference of the circle and is at right angles   to the circle you get a ring.

if the line contains the diameter, you get a sphere.

the the line is parallel to the diameter and touches the circumference, you get a donut.

i have a basic answer but if you want a more in depth