In 1779,what material was used in the Severn River Bridge ,which replaced the heavy,hand-cut stone voussoirs of earlier bridges?

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The question mentions that the Severn River Bridge replaced earlier bridges that used heavy, hand-cut stone voussoirs. This suggests that the new bridge utilized a different material. Among the given choices, only iron struts would be suitable for use in a bridge to replace stone voussoirs. Classical keystones and decorative crenellations are decorative features that do not serve as structural elements, while wooden arches would not be strong enough to support a bridge.

In 1779,what Material Was Used in the Severn River Bridge