Which of the following sentences is punctuated correctly?
A.
In 1921, Albert Einstein a highly regarded scientist won (the Nobel Prize in Physics).
B.
In 1921, Albert Einstein a highly regarded scientist won the Nobel Prize in Physics.
C.
In 1921, Albert Einstein, a highly regarded scientist, won the Nobel Prize in Physics.
D.
In 1921, Albert Einstein a highly regarded scientist—won the Nobel Prize in Physics.