A. Due to financial losses of the airline
B. As a result of a PIA plane crash in Lahore
C. Following the Karachi plane crash and allegations of fake pilot licenses
D. After PIA failed a safety audit by ICAO
Submitted by: Areesha Khan
Explanation: The ban was imposed after a PIA plane crash in Karachi that killed nearly 100 people. This was followed by a scandal over alleged fake pilot licenses revealed by former aviation minister Ghulam Sarwar Khan.
The correct answer to the question: "Why was PIA banned from operating flights to Europe in June 2020?" is "Following the Karachi plane crash and allegations of fake pilot licenses".