Answer:
The correct answer is option C.
Step-by-step explanation:
Alpha radiations are emitted by alpha particles imparts less amount of energy to the absorbing material.
Where as beta radiation by beta particles are more penetrating than the alpha particles and gamma rays are most penetrating radiations they can even penetrate through out a human body.
The order of penetration of these radiations from least to most is :
Alpha rays < Beta rays < gamma rays
Hence, the correct answer is option C.