We can actually deduce here that the phrase from the article that best supports the answer to Part A is: B. "that ability is somehow undermined when you're competing with a group" (Paragraph 17).
<h3>What is phrase?</h3>
Phrase refers to a group of words that actually function as a grammatical unit and are found within a sentence or clause.
Thus, we can see here that the phrase that best supports the answer to Part A is option B.