Some of the options provided are completely false, others are true, but were not discovered by Newton. Newton's discovery was D, that gravity is a universal phenomenon.
While it is true that all objects on Earth fall at the same rate of acceleration (or they would if there were no resistance from the atmosphere that would act differently on objects of different shapes), this was known before Newton's day.
Newton's insight was that the force that made things fall on Earth was also what made the moon orbit. This meant that the force was not confined to the Earth.
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