Explanation:

- The scenario involves a condition that requires 'B' to commit a crime (murder 'C'), which makes the condition illegal.

- Option 1: Regular - Regular transfers comply with legal standards and involve no illegal or immoral conduct. This does not apply here.

- Option 2: Irregular - Irregular transfers might involve unusual conditions, but they do not necessarily involve illegal acts. This also does not apply.

- Option 3: Void - A void transfer is one that has no legal effect from the beginning because it involves an illegal act. The condition to commit murder makes this transfer void.

- Option 4: Voidable - Voidable transfers can become void but are initially valid unless rejected. Here, the illegal condition makes it void, not voidable.