Can someone please help me​

the one that didn't occur is C.

byzantine empire is the answer i think you are looking for.

hope this : )

1) the andrew carniage's purchase and renovation of skibo castle have been very good and auspicious for the local people of dornoch firth, scotland because this is a turistic attraction for many people who would want to know the castle, the local people would take advantage about this.

2) yes, it could.