Sponge is to porous as rubber is to what?

• A. massive
• B. solid
• C. elastic
• D. inflexible

Answer: (C)

The correct answer is elastic because it captures a key characteristic that defines rubber. Just as a sponge is characterized by its porous nature—meaning it has a structure that allows it to contain spaces or holes—rubber is distinctly known for its elasticity. This property allows rubber to stretch and return to its original shape, making it highly versatile in various applications.

In context, both terms highlights a fundamental quality inherent to each material. Since sponge conveys the idea of having many small openings, elastic emphasizes rubber's ability to undergo deformation when stretched and revert back to its original form. This parallel demonstrates a relationship between a material and its defining characteristics, supporting the selection of elastic as the appropriate answer. Understanding these material properties enhances comprehension of their practical uses and inherent qualities.