The correct answer is A. Saloh.
The fruit demonstration farm in Una district of Himachal Pradesh is located at Saloh. It is a government farm that was established in 1962. The farm covers an area of 100 acres and is dedicated to the cultivation of fruits. The farm has a variety of fruit trees, including apple, pear, plum, peach, cherry, and apricot. The farm also has a research center that conducts research on fruit cultivation. The farm is open to the public and visitors can learn about fruit cultivation and see the different fruit trees that are grown at the farm.
The other options are incorrect. B. Ghanari is a village in Una district of Himachal Pradesh. C. Haroli is a town in Una district of Himachal Pradesh. D. Amb is a town in Una district of Himachal Pradesh.