Both were necessary skills during that time. They needed to know how to sail to get to distant trading spots, and when they got there, they needed to know the best way to trade for the most income.
I think the correct answer from the choices listed above is option B. A core belief of Christianity is the belief that Jesus is the Messiah. Many verses in the Bible say this that Jesus is the savior and that is what Jesus shows to us. Hope this answers the question.
Inner-city schools hope this helps