Answer: escalation of commitment
Step-by-step explanation:
Escalation of commitment is when an individual or firm chooses an option which tends to be unsuccessful but the individual or firm still continues with the project because there has been investment which has already been made on it.
From the question, we are told that Rachel pushed very hard to go with Project A rather than Project B. From the information given, despite the fact that project A has been unsuccessful, Rachel continued with it and invested more in it rather than changing or leaving it for project B. This shows that Rachel is engaging in escalation of commitment.