Q.

Planets are
(a)Luminous heavenly bodies revolving around a star
(b)Luminous heavenly bodies that do not twinkle
(c)Non-luminous heavenly bodies Right sign
(d)Luminous heavenly bodies that twinkle
Details:A planet is an astronomical body orbiting a star that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals

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