Best Rocket Engine for a 12 Light Year Journey?

I'm writing a Colonization story, and I'm trying to determine which propulsion system would be the best option. The destination is Kapteyn b, 12.76Ly from Earth, and our 40K colonists will be in Cryonic Suspension for the journey. I need an option that gives me at least 10% Light Speed for what will obviously be a huge vessel. Assume this takes place 50-100 years from now, so no Warp Drive or Antimatter systems. I don't mind getting a little creative, but I'd like to keep it as realistic as possible. Thanks in advance.

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Best Rocket Engine for a 12 Light Year Journey?

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