The First Step in the Disintegration of Uranium-238 Produces Thorium-234 $\alpha$

Multiple Choice

The first step in the disintegration of uranium-238 produces thorium-234.What particle is emitted in this reaction?

A) ( $\alpha$ particle)
B) neutron
C) proton
D) ( $\beta$ -particle)
E) ( $\gamma$ ray)