When comparing the advantages of trucks and rail as modes of transportation, a key advantage of trucks is that
they _____, while an advantage of railroads is that they _____
a. are less costly; offer the greatest flexibility in handling
b. offer faster and more frequent shipments; offer lower shipping costs
c. offer more flexibility in handling; offer greater dependability
d. are the fastest mode of transportation; are the most readily available mode of transportation
b
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