The logic follows here,
Assumption I: Exoplanets in habitable zones may have the potential to support life.
Otherwise, their discovery would not create “exciting prospects” for extraterrestrial life.
Assumption II: Current technology is insufficient to directly explore exoplanets in habitable zones.
This directly supports the claim about “technological limitations” posing obstacles.
Assumption III: Direct exploration will be unnecessary if we detect signs of life remotely.
The statement does not suggest abandoning direct exploration; it only says it is difficult.
Only I and II are implicit
Hence, the correct answer is "Option 1"