The correct answer is: A. Light engineering.
Tahliwal and Gagret are two towns in Himachal Pradesh, India. They are famous for their light engineering industries. Light engineering is a branch of engineering that deals with the design, manufacture, and maintenance of small machines and equipment. The industries in Tahliwal and Gagret produce a variety of products, including machine tools, agricultural equipment, and electrical appliances.
Option B, multi-industry, is incorrect because Tahliwal and Gagret are not known for their diversity of industries. Option C, pharmaceuticals, is incorrect because there are no major pharmaceutical companies in Tahliwal or Gagret. Option D, electronics, is incorrect because there are no major electronics companies in Tahliwal or Gagret.