Answer:
B. Low-performing Swedish teens improved their grades and social skills after gaming for a year.
Step-by-step explanation:
While all four pieces of evidence support the author's claim, there is no mention of answer choice B in his passage. Slightly-altered wording of answer choices A, C, and D can all be found in the passage, therefore the answer is B. Low-performing Swedish teens improved their grades and social skills after gaming for a year.