According to Section 5.2 of API 580:

“One objective of RBI is to determine what incident could occur (consequence) in the event of an equipment failure and how likely (probability) it is that the incident could happen.”

This is the foundational purpose of RBI: to determine both the likelihood and the consequence of a potential failure event, with specific emphasis on loss of containment.

While B, C, and D are partially true and are part of the broader RBI process, option A captures the exact phrasing and complete intent as outlined in the standard.