SAT English Practice Question

The article states that the "authors' main goal is to find an effective and efficient approach to teaching a specific skill." The authors argue that the approach is especially effective when "applied in the classroom to help students learn a new skill." However, the authors claim that using this new approach can be "challenging for instructors because it requires a new way of thinking about instruction." The article concludes by saying that this new approach is "likely to become more prevalent in education in the future".

1. A.challenging, for instructors because it requires a new way of thinking about instruction
2. B.challenging for instructors, because it requires a new way of thinking about instruction
3. C.challenging; for instructors because it requires a new way of thinking about instruction
4. D.challenging for instructors, because, it requires a new way of thinking about instruction