___________ is the first fully synthetic fibre

Options

A. Acrylic
B. Polyester
C. Nylon
D. Rayon

Explanation

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks for the name of the first fully synthetic fiber.

2. **Understand Synthetic Fibers**: Synthetic fibers are materials made entirely from synthetic (man-made) substances, as opposed to natural fibers which come from plants or animals.

3. **Consider Options**: The question implies that there are multiple options to choose from. One of the most common synthetic fibers is nylon.

4. **Define Nylon**: Nylon is a type of synthetic polymer that was first created in the 1930s. It is made from petrochemicals and does not use any natural materials in its production.

5. **Differentiate Between Synthetic and Semi-Synthetic**: It’s important to note that while nylon is fully synthetic, other fibers like rayon are considered semi-synthetic because they are derived from natural materials (like plant cellulose) that undergo chemical processing.

6. **Conclude the Answer**: Based on the information, the answer to the question is that "nylon" is the first fully synthetic fiber.

**Final Answer**: Nylon is the first fully synthetic fiber.

---