I'm not understanding the question, friend
Angela Duckworth was teaching math when she noticed something intriguing: The most successful students weren’t always the ones who displayed a natural aptitude; rather, they displayed something she came to think of as grit. Later, as a graduate student in psychology at the University of Pennsylvania, she defined the term — a combination of passion and perseverance for a singularly important goal — and created a tool to measure it: the “grit scale,” which predicted outcomes like who would graduate from West Point or win the National Spelling Bee. As a result of this work, Dr. Duckworth was named a MacArthur “genius” in 2013, and the notion of grit has become widely known. Her new book, “Grit: The Power of Passion and Perseverance,”
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I have finally mastered new tricks for the half-pipe: the poptart, the barrel roll, and the miller flip.</span>
Answer:
D
Explanation:
"Jeff, the famous author and inventor, arrived late at the lecture hall for his public appearance."
The famous author and inventor is adding details on Jeff, so commas have to surround it.
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I believe "who" is your answer. Hope this helps!
