The correct answer is A. Shimla.
The court of Judicial Commissioner of Himachal Pradesh was housed at Shimla. The Judicial Commissioner was the head of the judiciary in the princely state of Himachal Pradesh before it became a part of India in 1948. The Judicial Commissioner’s court was located in the old Secretariat building in Shimla.
The other options are incorrect. Barog is a town in Himachal Pradesh, but it was never the seat of the Judicial Commissioner’s court. Kullu is a district in Himachal Pradesh, but it was never the seat of the Judicial Commissioner’s court. Solan is a town in Himachal Pradesh, but it was never the seat of the Judicial Commissioner’s court.