Which of the following has won the Nobel Prize twice without sharing it with others?

Linus Pauling

The correct answer is Option (4) - Linus Pauling

Linus Pauling, the US chemist who posited that huge doses of vitamin C can ward off the common cold, is the only person to have been awarded two unshared Nobel Prizes—the 1954 Nobel Prize in Chemistry and the 1962 Nobel Peace Prize.