How can an app builder ensure that these opportunities are submitted into the approval process?

When an opportunity is closed date is pushed more than 30days, manager approval is required. An approval process is in place but reps frequently forget to submit for approval to run the process.

How can an app builder ensure that these opportunities are submitted into the approval process?
A . Change the entry criteria on the approval process to criteria are met and lock the record on initial submission.
B. Use a validation rule and an email alert to the manager requesting approval.
C. Submit the record for approval from an automated process.
D. Give the managerthe "API Enabled" permission to permit approval responses by email.

Answer: C