Three of the steps in the radioactive decay chain for ²⁴⁴₉₄Pu are shown in the following diagram. Below the symbol of each isotope are their half-lives. Identify the next isotope in the chain if the next step in the decay chain is an alpha emission.

• A. ²³⁶₉₆Cm
• B. ​²³⁶₉₂U​
• C. ²⁴⁴₉₆Cm
• D. ²⁴⁴₉₂U

Answer: (B)