Critical Reasoning

Computer Crimes Detective: A suspect monitored by our team was witnessed logging into Website X. Soon thereafter, Website X crashed due to a Trojan virus attack, causing damages estimated at millions of dollars. The same suspect also logged into Website Y. An hour after the suspect signed out of Website Y, it was attacked by the same virus and, subsequently, crashed. This strongly suggests that the suspect is either a hacker who is using this virus to shut websites down, or an unwitting user infected with the virus.

A major flaw in the detective's argument above is that

A) the detective overlooks the fact that during the second attack, the suspect had already been disconnected
B) the detective ignores the possibility that two different people could have used the same computer
C) the detective confuses the person who wrote the virus with the person who deployed it
D) the detective connects the cases of Websites X and Y and supposes that a pattern exists
E) the detective ignores the possibility that other people may have also been logged into the websites the same time that the suspect was

OA E

Source: Economist Gmat