According to Kepler's Third Law of Planetary Motion, the square of the orbital period ($T$) of a planet is proportional to:

Options:

  • A: Cube of the semi-major axis ($r^3$)
  • B: Square of the semi-major axis ($r^2$)
  • C: Semi-major axis ($r$)
  • D: Inverse cube of the semi-major axis ($1/r^3$)

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