What should the Architect analyze to diagnose the cause of this issue?

A customer launches a Campaign with multiple touch points. Some deliveries are stuck in Pending Personalization’’ for more than 3 hours. The recipient broad log records have not been created for these deliveries yet.

What should the Architect analyze to diagnose the cause of this issue?
A . Validate if the delivery is complex with many JavaScript personalization and whether the email size more than 60 kb
B. Validate if all images can be uploaded into public resources to fetch faster and if personalization blocks can be created in the delivery.
C. Validate if the number of recipient per delivery can be reduced to send multiple deliveries at the same time to spread the load on personalization.
D. Validate if the delivery can be paused and the MTA process restarted to clear the personalization cache and reuse the delivery.

Answer: C