Consider the following: [Defence]

I. Cigarette butts

II. Eyeglass lenses

III. Car tyres

How many of them contain plastic?

The correct option is All the three.

Let us analyze each item step-by-step to understand why they all contain plastic:

I. Cigarette butts: Contrary to popular belief that they are made of biodegradable paper or cotton, the filters in cigarette butts are actually made of cellulose acetate, which is a type of bioplastic. Because cellulose acetate decomposes very slowly under normal environmental conditions, discarded cigarette butts are a significant source of plastic pollution.

II. Eyeglass lenses: Traditionally, eyeglass lenses were made of glass. However, modern eyewear technology has shifted almost entirely to plastic materials for safety, weight reduction, and durability. Commonly used plastics for eyeglass lenses include CR-39 (a plastic polymer), polycarbonate, and high-index plastics.

III. Car tyres: While tyres are commonly thought of as being made of natural rubber, modern tyres are actually a complex mixture of natural rubber, synthetic rubber (which is a plastic polymer derived from petroleum), fabric, and wire. Synthetics like styrene-butadiene rubber (SBR) are essential for durability and performance, meaning that tyres contain a significant proportion of plastic polymers.

Since all three items (Cigarette butts, Eyeglass lenses, and Car tyres) contain plastic materials, the correct answer is indeed All the three.