Instantaneous is to quick as
- eternal is to long (correct answer)
- immediate is to prompt
- rapid is to speedy
- brief is to short
Explanation: Instantaneous represents extremely quick timing, happening without any delay. Eternal represents extremely long duration, continuing without any end. Both show maximum intensity of time concepts in opposite directions. Choice B shows equivalent fast timing terms rather than intensity progression. Choice C shows synonymous speed terms rather than time intensity. Choice D shows equivalent brief duration terms rather than intensity extremes.