The student wants to acknowledge a complication affecting travel thro… | Verbal SAT Question

While researching a topic, a student has taken the following notes:

Albert Einstein’s theory of general relativity allows for potential shortcuts through spacetime.
These hypothetical spacetime tunnels are known as wormholes.
For matter to travel through a wormhole, it would need to have negative energy density.
Negative energy density means that the matter would have less energy than empty space.
Such matter has not been shown to exist.

The student wants to acknowledge a complication affecting travel through wormholes. Which choice most effectively uses relevant information from the notes to accomplish this goal?

The hypothetical tunnels known as wormholes would be potential shortcuts through spacetime were it not for one complication: they have less energy than empty space.

Einstein’s theory of general relativity allows for potential spacetime shortcuts called wormholes but does not explain how matter with negative energy density could travel through them.

For matter to travel through a wormhole, the matter would need to have less energy than empty space; such matter has not been shown to exist.

For wormholes to be possible, according to Einstein’s theory of general relativity, they would have to allow for potential shortcuts through spacetime.