(c) 3 only
Statement 2- Incorrect because Amarsimha belonged to the Court of Chandra Gupta- II (he was one of the navratna).
Thus, by elimination we are left with correct answer C.
Statement 3- Correct because Kalidasa belonged to the Court of Chandra Gupta- II (he was one of the Navratna).
Statement 1- Incorrect because Panini belonged to the 5-6th Century BCE Period- he wrote Astdhyayi, where as Pushyamitra Sunga belonged to the Post Mauryan Period- 2nd Century BCE- he came to power after killing last Mauryan King- Brihadratha.