In which year did the state of Himachal Pradesh come into existence?

1971

The correct answer is Option (1) → 1971

The state of Himachal Pradesh came into existence on January 25, 1971. While Himachal Pradesh existed as a centrally administered territory earlier, the State of Himachal Pradesh Act was passed by the Parliament on December 18, 1970, formally recognizing it as a state within the Indian Union.