A large number of computers in a wide geographical area can be efficiently connected using

Communications satellites can efficiently link many computers spread over a wide geographic area.

Twisted pair lines carry signals only short distances and suit local wiring, not vast areas.

Coaxial cables also serve limited spans, such as within a building or neighbourhood.

The short-range cables cannot efficiently cover a wide area, so a combined answer does not hold.

Satellites relay signals across continents without laying physical cable everywhere.

Satellite links are useful for remote regions where cabling is impractical.