Ashoka, the greatest king

Ashoka, the greatest king not only in Mauryan dynasty but also among all the kings in Indian History, was born to
      a) Srigupta and Sujata
      b) Bimbisara and Subadrangi
      c) Bindusara and Sujata
      d) Chandragutpa Maurya and Subadrangi

Ans: ( b )