All moons are natural satellites. Some natural satellites are irregular in shape. What can be concluded about moons?

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Think in terms of categories: moons are a subset of natural satellites. If some natural satellites are irregular in shape, it’s possible that one of those irregular natural satellites is a moon, since moons are among natural satellites. So it’s consistent to conclude that some moons could be irregular in shape. The other options demand stronger claims (that all moons are irregular, that no moon is irregular, or that all natural satellites are moons) which aren’t guaranteed by the given statements. Therefore, the best conclusion supported by the information is that some moons are irregular in shape.