The large volume of transactions associated with these activities seems to have necessitated hierarchical management structures well before the advent of modern communications and transportation.
方案推理
目标 drive competitors off those routes
方案 reduce fares on certain routes to a level at which they lose money
加强
原文给的弱点是，其他公司会采用一样的方式低价竞争，那么就无法赶走竞争者，达不到目标
加强这个推理，就是让弱点变得invaild
证明对手不会采取低价竞争，或者竞争不过主角公司就OK
he does rightly see Jackson's tenure (the seventh presidency) as the culmination of the acceptance of party, commerce, and individualism.
C选项：party是在这时候才合法，并不是这时候才建立
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The large volume of transactions associated with these activities seems to have necessitated hierarchical management structures well before the advent of modern communications and transportation.