Comets have tails because, the sun vaporizes part of the ice of the comet, hence option 1 is the correct option.
The Sun's heat vaporizes little of the comet's material, which releases dust particles trapped in the ice. A combination of solar radiation pressure and solar wind blow away gas and dust from the comet's nucleus, forming two separate tails: the ion tail and the dust tail.
Hence, as the sun vaporizes part of the ice of the comet, comets have tails hence option 1 is the correct option.
Refer to the following link to know more about comets:
https://brainly.com/question/12443607
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