Which of the following represents an alpha particle? Select all that apply.

• A. ${}_1^1\text{H}$
• B. ${}_2^4\text{He}$
• C. ${}_2^4\alpha$
• D. ${}_1^0\text{e}$
• E. ${}_1^1\text{p}$
• F. A and E.
• G. B and C.
• H. All of the above.

Answer: (G)