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Answer: Yoga and Pilates.
Explanation: This paragraph states that while yoga and pilates are quite similar, they also have subtle differences. From this, you can infer that yoga and pilates will be compared in the rest of the passage.
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1) The subject is b. Kayla
2) The subject is a. I
Explanation: A subject is the noun performing an action at the beginning of the sentence
It is an example of a hyperbole.