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Correct Answer: Option D — Mercury. Mercury is correct because it is it has no natural satellite. Mercury is also associated with a terrestrial planet. A further identifying fact is that Mercury is the shortest orbital period among the planets. Another useful fact is that Mercury is associated with it has no natural satellite. Why the other options are incorrect: Option A — Venus: It is it rotates in a retrograde direction and is associated with a terrestrial planet; those are the identifying facts of Venus. Option B — Earth: It is the Moon is its only natural satellite and is associated with a terrestrial planet; those are the identifying facts of Earth. Option C — Mars: It is Olympus Mons is located on it and is associated with a terrestrial planet; those are the identifying facts of Mars. Exam Takeaway: Link Mercury with “it has no natural satellite” and “a terrestrial planet” for quick revision.
