They're so bright! They're using these images which are currently shared in SocialProfile/images, where I've made a list which also map to their current color (Note: the colors in the parentheses aren't mapped to color keywords, they're just what color they look like in general):

• vote-bar-1.gif - #4b9af6 (blue)
• vote-bar-2.gif - #ff1800 (red)
• vote-bar-3.gif - #0cff00 (green)
• vote-bar-4.gif - #f0ff00 (yellow)
• vote-bar-5.gif - #ba00ff (purple)

Having 5 different colors doesn't create any priority as you can't easily tell which one is the correct one and which ones are wrong. Instead, there should only be 2 colors, where the 1st color is mapped to the correct choice/most voted choices, and the 2nd color are mapped to all the other incorrect choices/every other choice. There is the WikimediaUI color palette, which can be found at M82:

M82 Color palette (Wikimedia Design Style Guide/WikimediaUI)

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I believe Green50 (#00af89) should be used for the correct/most voted choice.

For incorrect choices, I think using Red50 (#d33) would appear as too aggressive. Instead, I suggest using Base70 (#c8ccd1).