This answer is strongly supported. If Newton’s reference to “giants” typically referred to the ancient Greeks, then it is highly unlikely Newton’s famous quote was intended to give credit to Hooke for Newton’s theories of light. Besides, we know Newton was not characteristically conciliatory.

This answer is unsupported. We don’t know for a fact if Newton did not take credit for any part of Hooke’s work. We only know from the stimulus that Hooke claims that most of Newton’s theories were based on Hooke’s work.

This answer is unsupported. We don’t know from the stimulus what Newton believed about Hooke’s work.

This answer is anti-supported. According to the stimulus, "giants" would have usually meant the ancient Greeks, and Newton was usually not conciliatory towards his contemporaries, so it's unlikely he intended to acknowledge any contemporary scientists.

This answer is unsupported. We don’t know from the stimulus what Newton knew about any of Hooke’s work. We only know that Hooke claimed that most of Newton’s theories were based on Hooke’s work.