An advantage of expansion bends is that they are __________ than expansion joints.

The correct answer highlights that expansion bends are indeed stronger than expansion joints. This strength is significant because expansion bends are designed to accommodate thermal expansion and contraction in piping systems, providing greater structural integrity under varying temperature conditions.

Since expansion bends are fabricated as part of the pipe system, they typically maintain a more robust and continuous profile, which can enhance their ability to withstand pressure and stress when compared to expansion joints. Expansion joints often involve more moving parts and flexible materials, which can be prone to wear and fatigue over time, thus potentially compromising their strength.

In contrast, the other options present attributes that are not typically associated with expansion bends. While they may be more compact or easier to service compared to some designs of expansion joints, the primary distinguishing factor is their strength. Additionally, the weights of these components can vary, and strength remains the key focal point in comparing their advantages.