What type of malware is most likely responsible for these symptoms?

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Your friend complains that they recently installed a new browser extension to help find online discounts. However, since installing it, they have been experiencing an excessive amount of pop-up ads and unrelated advertising banners on web pages.

What type of malware is most likely responsible for these symptoms?
A . Trojan malware
B . Adware
C . Ransomware
D . Spyware

Answer: B