G
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Time travel is possible through wormholes by entering a black hole and exiting out its corresponding white hole (something that can only spit things out while a black hole can only suck things up). This wormhole would looke like an hourglass because of the black hole shaped like a funnel and the white hole also shaped like a funnel. Both of their singularities (centers) would connect so if someone jumped into the black hole, of course with oxygen and materials strong enough to stand the gravity in a black hole, they would pop out of the other end out of the white hole in not only another universe but another time. They would have traveled faster than the speed of light because they were inside a black/white hole and their escape velocities are greater than the speed of light, so they can pull in/spit out light and since their escape velocities are greater than the speed of light, anyone in a black/white hole would travel faster than the speed of light and thus time would pass slower for them.