Which of the following was the first fully synthetic fibre?

Nylon 

The correct answer is option 3. Nylon.

The first totally synthetic fiber, nylon, was created in 1931 without the use of any natural raw materials. It was made using chemicals. Stockings, vehicle belts, parachutes, ropes, and other items are made from nylon fibers because they are durable, glossy, and elastic.