The uranium-238 decays to thorium-234 by process of ______?

Fusion

Alpha radiation

Fission

Beta radiation

None of these

Uranium-238 ( $^{238}U$ ) undergoes alpha decay, emitting an alpha particle ( $^4He$ ), reducing its atomic number by 2 and mass number by 4.

This transforms it into Thorium-234 ( $^{234}Th$ ).