Which of the Following Types of Radiation Will Pass Through ${ }_{2}^{4} \mathrm{He}$

Multiple Choice

Which of the following types of radiation will pass through a piece of paper,but will be stopped by 0.5 cm of lead?

A) α
B) β
C) ${ }_{2}^{4} \mathrm{He}$
D) γ
E) All of the above will pass through 0.5 cm of lead.