Which of the following methods is NOT a viable option to build high speed spaceships for intergalactic travel?

Select one:

a. Using gigantic fuel tanks to get propulsions that are enough to reach 0.2 c.

b. Themo-nuclear engines to achieve speeds around 0.1 c.

c. Matter, anti-matter engines that would use energy created from their annihilation to propel the spaceship forward.

d. By harnessing the Hawking Radiation of a small size Black Hole.

e. Light sails that would use the momentum transfer from a very powerful laser beam.