The Assam Horticultural Research and Training Institute is located in:

The correct answer is: b) Jorhat.

The Assam Horticultural Research and Training Institute (AHRTI) is a research institute located in Jorhat, Assam, India. It was established in 1958 by the Government of Assam with the objective of conducting research on horticulture and training personnel in horticulture. The institute has a campus spread over 100 acres and has a staff of over 100 scientists and technicians. The institute conducts research on a variety of horticultural crops, including fruits, vegetables, spices, and flowers. It also offers training programs in horticulture for farmers, extension workers, and students.

The other options are incorrect because:

• Guwahati is the capital of Assam and is located in the central part of the state.
• Dibrugarh is a city in the upper Assam region.
• Silchar is a city in the Barak Valley region.