Answer:
A) Consider sending a printed message.
Step-by-step explanation:
According to the scenario, the most sensible step to get an important response from a supplier after the supplier has not responded would be to send a printed message.
This option would be ideal among the other alternatives above, as it demonstrates that you understand that the supplier may not have seen or been aware of your question, even if numerous e-mails have already been sent, and still awaits an answer , in accordance with professional and ethical communication standards.