Answer: D. attending college is still a smart career move for students.
Step-by-step explanation:
The phrase from the Introduction paragraph that is the concession is that "attending college is still a smart career move for students"
From the paragraph, we can infer that despite the writer agreeing that opportunities to earn a good living without a college degree seem to be growing, he stated that attending college is still a smart career move for students.
This point was further justified as the writer said attending college will opens up more opportunities for one to get a job, helps one figure out the kind of jobs that the want and also help them earn more money in their lifetime.
This shows that attending college is really a smart move.