The dhow was used for heavy items that were not as fit for land-based trade. ... The dhow and lateen sail did for maritime trade what the saddle and stirrup did for land trade: they helped people widen networks of trade and communication thus accelerating the diffusion of goods, ideas, and culture.
C. this is a clear appeal to emotion because it appeals to our emotions that get elicited when someone says "we, as human beings, ...". This is supposed to elicit our compassion and feelings of empathy towards other people.
For that reason C is the only correct answer.
Electric streetlights, your welcome .
