Number 2 is the answer I think
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,”
