if there is unjustified accounting change the — modify 
if there is material weakness in Internal Control System  then — generally such thing is not reported in audit report of financial statements but author wants to say EOM can be given, i dont fully agree with that. There is no such reference in SA 706. EOM is to enhance understanding of users of financial statements. So if authors want to stretch this and extent EOM requirement then is personal judgement, still it can be given only if such weakness in explained in notes to accounts.
final conclusion answer “a” can be justified