An 802.11ac wireless bridge is the most practical solution to connect two nearby buildings without trenching or laying physical cable. It provides high-speed, point-to-point connectivity using directional antennas.
A). Multimode fiber is effective but expensive and typically limited to 500 meters or less.
C). Cat 6 copper is only rated for up to 100 meters - not viable for a street-wide distance.
D). Loopback adapter is a troubleshooting tool, not for network extension.
# Reference:
CompTIA Network+ N10-009 Official Objectives: 1.3 - Compare and contrast various network topologies, types, and technologies.