A rope that is made of what material can float?

The correct answer is that a rope made of polypropylene can float due to the properties of the material. Polypropylene is a type of plastic that is less dense than water, which allows it to remain buoyant. This characteristic is particularly useful in applications where the rope may be used on water, such as boating, fishing, or water sports.

In contrast, natural fibers, including hemp and ramie, have a tendency to absorb moisture, which increases their weight and causes them to sink in water. While hemp is traditionally known for its strength and durability, it does not have the buoyant properties of polypropylene. Ramie, although a strong fiber, also lacks the ability to float as it is water-absorbent. Thus, polypropylene stands out as the ideal choice when a floating rope is needed.