A sports medicine journal found online is the most credible source because it focuses on the topic of sports medicine.
The other answers are wrong because they are not credible, like the professional athlete who doesn't specialize in medicine or the article in the historical section, or on topic, humorous essay.
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Assuming that you're talking about the passage about Joe Wilson and his mates, the inference that you can make is : The narrator was attracted to Mary.
You can see it on how the narrator said that his heart skipped when he saw Mary, etc
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The answer is D. As her leg jiggled up and down, she chewed a ragged nail and checked her watch.
Explanation:
Syntax is a component of language that focuses on the arrangement of elements or structures used to convey ideas. Traditional syntax follows the subject-predicate structure; this means the agent of the action is followed by the action. This arrangement can be seen in the section "she (subject) chewed (verb) a ragged nail and checked (verb) her watch".
Besides this, to preserve the traditional structure other details such as complementary clauses are usually placed at the beginning and separated by a comma or similar punctuation. This occurs in "As her leg jiggled up and down" because this detail complements the sentence and is placed before the main clause separated by a comma.