Answer: Option C
Step-by-step explanation:
Beta particles have more penetrating power as compared to that of alpha particles. This is so because the size of alpha particles are larger that beta particles.
The smaller beta particles penetrates more in the skin and it can even pass through the skin, absorbed by a few centimeter of body tissue or few millimeter of aluminium.
But gamma radiation is more penetrating out of alpha, beta and gamma. Hence, the correct answer is option C