Dog Habits

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The best way to install good habits in a dog is to condition it with short verbal commands and edible rewards before they solidify bad habits when aging takes effect.

Review: Dog Habits


Explanation

Creating a filter: In the original sentence here, there may be more than one problem, but we can fixate on the use of grammatically singular "dog" early in the sentence and grammatically plural pronoun "they" later on.

Applying the filter: our filter eliminates choices (A), (B) and (D).

Finding objective defects: we compare how (C) and (E) begin. Choice (C) is idiomatically poor, and moreover the beginning of the sentence should be parallel with "to install," because the linking verb "is" equates the grammatical subject and predicate of the sentence. The correct answer is (E).


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