. A reference planet (planet A) has a flattening index of 0.05. Place the planets (A to D) in order of roundest to flatt

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. A reference planet (planet A) has a flattening index of 0.05.
Place the planets (A to D) in order of roundest to flattest using
the following information [6]: Planet B spins at four times the
rate of planet A but has half the mass and 1/3 the mean radius of
planet A. The difference between rp and req is the same for planet
C as for planet A but the ratio of the respective mean radii (i.e.
planet A: planet C) is 3:1. Planet D has the same mass as planet C,
rotates at 4 times the rate as planet C and its mean radius is 3
times smaller than planet C’s.