What is a possible reason to get this error message?

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A developer gets an error saying ‘Maximum Trigger Depth Exceeded.’

What is a possible reason to get this error message?
A . The SOQL governor limits are being hit.
B . A Process Builder is running that sends mass emails.
C . Trigger is recursively invoked more than 16 times.
D . There are numerous DML operations in the trigger logic.

Answer: C