Radioactive Decay

Step 1: In decay, the spin-parity values of the initial and final states are determined by the selection rules and the spin-parity coupling during the decay process.

Step 2: The first forbidden decay results in a change in both the parity and the spin. In this case, the only valid transition that satisfies the spin-parity conservation and the selection rules is from to .
Thus, the correct answer is (A).