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Gen. Joseph Hooker initially had seized the advantage at the Battle of Chancellorsville, and he had had an army twice the size of Gen. Lee's Confederates, but having lost his nerves, he had settled into a more defensive posture, and his army eventually was suffering a humiliating defeat.
A. Hooker initially had seized the advantage at the Battle of Chancellorsville, and he had had an army twice the size of Gen. Lee's Confederates, but having lost his nerves, he had settled into a more defensive posture, and his army eventually was suffering
B. Hooker at the Battle of Chancellorsville seized initially the advantage, and he had an army twice as big as Gen. Lee's Confederates, but his nerves were lost, and he settled into a more defensive posture, and his army eventually would suffer
C. Hooker, initially seizing the advantage at the Battle of Chancellorsville, had an army twice as big as Gen. Lee's Confederates, and he lost his nerve and settled into a more defensive posture, so that his army eventually would suffer
D. Hooker initially seized the advantage at the Battle of Chancellorsville, but despite having an army twice the size of Gen. Lee's Confederates, he lost his nerve and settled into a more defensive posture, his army eventually suffering
E. Hooker initially seized the advantage at the Battle of Chancellorsville and he had an army twice the size of Gen. Lee's Confederates, but despite this, he lost his nerve, settling into a more defensive posture, and his army eventually suffered
Official Explanation
A question about Robert E. Lee’s masterpiece, his defeat of Hooker at Chancellorsville.
This sentence contains the idiom “to lose [one’s] nerve”: this means to lose one’s determination or resolve to face a difficult situation, after having thought that one could face it.
The young baseball player lost his nerve when he stepped on the field for his first championship game.
Shelley wanted to demand a raise from her boss, but when she was face-to-face her boss, Shelley lost her nerve.
In this sentence, we saying that Gen. Hooker “lost his nerve” at Chancellorsville. The variants “lost his nerves” or “his nerves were lost” are awkward and ungrammatical: choices (A) & (B) make these mistakes.
Choice (A): in addition to the idiom mistake discussed above, the progressive tense verb “was suffering” is incompatible with a specific past event. This entire choice suffers from what I call “laundry-list parallelism,” a list of facts without much attempt to show their interconnection. This choice is incorrect.
Choice (B): in addition to the idiom mistake discussed above, the adjective “initially” is awkwardly placed—everything about that first clause is awkward. This choice also suffers from a particularly clumsy form of “laundry-list parallelism.” This choice is incorrect.
Choice (C): What most striking about this version is the lack of contrast. We are told that Hooker “seized the advantage” and he had an army “twice the size” of his enemy’s army—these fact suggest things were going very well for him. Then the word “and,” and we are told that he lost his nerve and lost the battle. Wait! That’s a huge turnaround, and we never had a contrast word. If the “and” before “he lost his nerve” had been a “but,” this version would be better, but it’s too illogical without a proper contrast work. Finally, the phrasing of the last clause suggest that it was Hooker's purpose to make his army lose the battle—that's also illogical! This version is incorrect.
Choice (D): this version sets up appropriate logical contrasts that mirror the content. The end of this sentence is an absolute phrase, a perfectly correct structure.
Choice (E): the proper antecedent for a pronoun is a noun; a pronoun cannot refer to the action of a clause. In this version of the sentence, the pronoun “this” refers to all the information in the previous clause—that’s way more than a pronoun is allowed to capture. This choice is incorrect.
The only possible answer is (D).