The reason why this would be your answer is because when you look at the question, you're going to see the words "professional resource" and that is a key to getting your answer. School Counselors are a professional resource that could be used for people with emotional issues that could possible need to be professionally helped.
Answer choices 1). Friend, 2). Parent, 3). Teacher wouldn't be the right answer because they are not professionally trained to deal with teenagers that have emotional issues.