Neutron star, moon and the white dwarf is the correct order from smallest to largest.
The size of neutron star is 20 kilometers, the size of moon is 3,474.8 km and the size of a white dwarf is 4,300 kilometers. According to this data, neutron star is the smallest one which is followed by moon and the biggest one is the white dwarf star. We know that more in diameter represents more in size and less in diameter shows less in size.
So we can conclude that neutron star, moon and the white dwarf is the correct order from smallest to largest.
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