This is a classic example of Business Email Compromise (BEC), where attackers spoof or compromise trusted email accounts to trick employees into performing unauthorized financial transactions.
Vishing (B) is voice phishing, spear phishing (C) targets individuals with customized messages, and impersonation (D) is a general term for identity deception but BEC specifically describes financial fraud via email.
BEC is a major threat covered in the Threats domain of SY0-701#6:Chapter 2 CompTIA Security+ Study Guide#