The correct answer is: A. SH-22
SH-22 is the smallest State Highway of Himachal Pradesh. It is a 100-kilometer-long highway that connects the towns of Mandi and Kullu. The highway is a two-lane road that is well-maintained and in good condition. It is a popular tourist route, and offers stunning views of the Himachal Pradesh mountains.
The other options are incorrect because they are all longer than SH-22. SH-39 is a 200-kilometer-long highway that connects the towns of Shimla and Manali. SH-8 is a 300-kilometer-long highway that connects the towns of Pathankot and Shimla. SH-1 is a 400-kilometer-long highway that connects the towns of Delhi and Shimla.