What is the most important reason for citing a source when quoting it directly?

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.

d. it spread christianity. i just took the test and got it right.