The correct answer is: B. 15th April, 1948
The Chief Commissioner’s Province of Himachal Pradesh came into existence on 15th April, 1948. It was formed by merging the erstwhile princely states of Chamba, Mandi, Suket, Bilaspur, Sirmaur, Nahan, Kulu, and Keonthal. The Chief Commissioner’s Province of Himachal Pradesh was a part of the Indian Union.
The Chief Commissioner’s Province of Himachal Pradesh was a mountainous region with a population of about 1.5 million people. The capital of the Chief Commissioner’s Province of Himachal Pradesh was Shimla.
The Chief Commissioner’s Province of Himachal Pradesh was a part of the Indian Union until 1972, when it was granted statehood.