'A' and 'B' plan to rob a bank. A went to the bank and killed the cashier with his pistol and took the money. While 'A' was returning from the bank, he was also killed by the guard of the bank, 'B' who was waiting outside the bank on his motor cycle fled. What is the criminal liability of 'B'?

• A. no liability
• B. Liable only for criminal conspiracy
• C. liable only for robbery
• D. Liable for both murder and robbery of cashiers