A. They were being planned but had not been built
B. They were seriously underdeveloped.
C. They had begun to compete with the Eric Canal for traffic.
D. They were weakened by the expansion of the canal.
Đáp án là C
Đoạn 4: “Increased traffic would undoubtedly have warranted its construction had it not been for the railroads.” = Lượng giao thông tăng thêm không nghi ngờ gì đã chứng minh công trình này là đúng nếu không vì những tuyến đường sắt
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