6. A person uploads a video to a website, and viewers can rate it on the website: those who like it add 1 point; those who dislike it deduct 1 point. Each video starts with 0 points. After some time, the person sees that the video has scored 90 points, and 65% of the voters like the video. Then, ( ) people have voted on this video.
(A) 200
(B) 300
(C) 400
(D) 500
(E) 600
6. B.

Suppose a total of $x$ people voted on the video. Then $65 \% x$ voted in favor, and $(1-65\%)x$ voted against.
$$
\text { Therefore, } 65 \% x-(1-65 \%) x=90 \Rightarrow x=300 \text {. }
$$