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Option 1 states that Venus is the nearest planet from the Sun. This statement is incorrect because Mercury is actually the nearest planet to the Sun, not Venus. Therefore, option 1 is not correct.
Option 2 states that Venus is only slightly smaller than the Earth. This statement is incorrect. Venus is actually very close in size to Earth, making it almost the same size as our planet. Therefore, option 2 is not correct.
Option 3 states that Venus has no atmosphere. This statement is correct. Venus has a very dense atmosphere that is mainly composed of carbon dioxide. This dense atmosphere creates a greenhouse effect, leading to extremely high surface temperatures on Venus. Therefore, option 3 is correct.
Based on the analysis above, the correct answer is option 3: "2 only." Both options 1 and 2 have incorrect statements, while option 3 has the correct statement regarding Venus`s atmosphere.