In the following question, sentence given with blank to be filled in with an appropriate word(s). Four alternatives are suggested for the question. Choose the correct alternative out of the four and indicate it by selecting the appropriate option. The gate _______ by the watchman on duty.
10. Stripped of his heavyweight title in 1967 for refusing induction into the U.S. military, Muhammad Ali regained the heavyweight championship on October 30, 1974, in Kinshasa, Zaire with an eighth-round knockout of which prizefighter?