Respuesta :
A least authoritative source for a science project about the solar system would be a book about the atmosphere and geology Venus published in 1959.
An authoritative source as used here would be a verified and accurate information that can be used to provide validity. It could also refer to something that has expertise on your topic of interest.
The least here is option b because the topic it covers is on the atmosphere and geology meanwhile the concern is on the solar system.
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