The correct options are
B The charge on the inner surface of the shell will be
+3C, and it can be distributed uniformly or nonuniformly
C The net charge on the outer surface of the shell will be
+7C, and it's distributed would be uniformly
Due to induction, charges on various faces are as shown in Fig.
Charge on the inner surface of the shell
=+3CNet charge on the outer surface of the shell
=−3C+10C=+7CDistribution of charge on the inner surface would be uniform if charge is placed at the centre, otherwise non-uniform. On outer surface, charge would be always uniformly distributed as the displacement of inside charges does not effect the distribution of the outer charge.