Answer: Option (b) is the correct answer.
Step-by-step explanation:
A beta particle is a particle with a negatively charged electron. Symbol of a beta particle is
.
An alpha particles is basically a helium nucleus and it contains 2 protons and 2 neutrons.
Symbol of an alpha particle is
.
A gamma particle is basically a photon of electromagnetic radiation with a short wavelength.
Symbol of a gamma particle is
.
Therefore, we can conclude that the charge of a beta particle is 1-.