Final answer:
The River Metaphor is most similar to the bridge metaphor as it represents flow and connection, and a river is typically the obstacle over which a bridge is built.
Step-by-step explanation:
Among the options provided, the metaphor that is most similar to the bridge metaphor, which denotes a means to bring across or carry across, would be (b) The River Metaphor. A bridge is a structure that provides a passage over an obstacle, typically water, which is why a river is conceptually related as it is often the obstacle over which a bridge is built. The river metaphor can also represent flow, movement, and connection between two points, whereas trees, gardens, and puzzles do not inherently suggest transition or conveyance.