How does a timing belt differ from a timing chain?

The distinction highlighted in the correct choice focuses on the materials and maintenance needs of timing belts compared to timing chains. A timing belt is indeed made of rubber, which makes it more prone to wear and tear over time. As a result, it requires more frequent replacement to ensure proper engine timing and to prevent potential engine damage.

On the other hand, timing chains are typically made of metal, which contributes to their durability and longevity. They usually do not require replacement as often as timing belts, often lasting the lifetime of the engine with proper maintenance. This difference in material contributes significantly to the differing replacement intervals between the two components, making the correct answer relevant and accurate in the context of engine repair knowledge.