Which of the following describes the middle passage of the triangular trade route?

a) the transport of slaves from africa to the americas, during which nearly 20 percent of slaves died
b) the transport of manufactured goods from europe to africa, where they were traded for slaves
c) the transport of slaves from america to europe, where they were traded for tobacco and sugar
d) the transport of goods from africa to europe, during which nearly 20 percent of sailors contracted smallpox