The correct answer is social engineering
Social engineering is the ability to gain access to confidential information or important areas of an institution through persuasion skills.
Social engineering plays a key role in a large number of cyber attacks, regardless of whether the crime is large, small or sophisticated.
In the context of cyber crime, Social Engineering is widely described as a non-technical method used by cybercriminals to obtain information, conduct fraud or gain illegal access to victims' machines. Social Engineering is based on human interaction and is driven by people who use the scam to violate the security procedures they should have followed.
Common Social Engineering and attacks include phishing emails, vishing (phone calls from people posing as a respected company) and baiting (in English “fleshy”, where the attacker inserts malware into USB drives and then simply waits the user to connect them to the machine).