The correct options are
B Prashastis are not always true.
C Rulers always wanted to depict themselves as valiant and victorious warriors.
D A prashasti dedicated to Nagabhata, a Pratihara king has been found in Gwalior.
Prashastis were usually inscriptions in praise of kings. One of the prashastis dedicated to Nagabhata describes his victories and valour. Kings often wanted to hear good things about themselves.