What does the term "pliable" refer to?

The term "pliable" refers to something that is easily bent or flexible. This word is often used to describe materials or substances that can be shaped or manipulated without breaking. For example, a pliable piece of plastic can be molded into different forms without losing its integrity. This quality suggests adaptability and a readiness to yield to pressure or influence, whether in a physical form or metaphorically in terms of attitudes or opinions.

The other choices describe attributes that do not align with the core meaning of "pliable." For instance, the terms "difficult to change," "expensive and luxurious," and "strong and robust" imply rigidity, permanence, or high-quality strength, which contrast directly with the idea of flexibility and adaptability inherent in "pliable." Thus, the correct answer captures the essence of the term by emphasizing its flexible nature.