Nhận biết (M1)

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?

• A.

  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.

• B.

  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.

• C.

  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.

• D.

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