CompTIA A+ 220-902 Question E-50

A user has recently installed Windows 7 on a computer. They ran Windows updates, updated the firmware and installed a printer. The user accessed a P2P application and now they are getting a large amount of browser pop-ups. Which of the following is MOST likely the cause of the pop-ups?

A. Phishing
B. Malware
C. Proxy redirect
D. Firmware