Answer:
A. Vishing
Step-by-step explanation:
The term 'Vishing' is a combination of 'Voice' and 'Phishing'.
Phishing is to get personal or confidential information (like credit card numbers) by pretending to be a trusted and enticing unsuspected individuals to provide their information, believing they're dealing with a reputable institution.
The question states the hacker is using telephone and voice technologies... so it's a voice version of the phishing.