Answer: He should tell the teacher and discard them in the proper container.
Step-by-step explanation:
Since, Ben forgot to label the solutions, it is advisable to inform the teacher and discard the solutions separately in proper containers. Ben should not smell or taste them as solutions can be toxic and hamper health. He should not mix the solutions because the solutions can react violently with each other. The best method to ensure proper laboratory safety is to pack the solutions in proper container separately and discard.