Which dotted line best represents the trans Saharan trade network

Its C on the Map but for the answer choices its B. I just took the test.

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.