Explanation

If you notice the same direction trigger so too, you can recycle the clue personalities for the blank. None of initiations, implementations, or rationalizations means personalities, so eliminate choices (A), (B), and (D). Although aptitudes means skills, which pets can have, it does not directly relate to the clue in the sentence, personalities. So eliminate choice (C), and select choice (E).


Hence option E is correct!
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The sentence is trying to make a comparison between people's personalities and some particular attribute of pets- E does this because temperaments essentially mean moods.

best way to not get confused with the answer choices is to write down your prephased word and then compare them with each of the options.