The sentence that correctly uses a comma to join an independent and dependent clause is, "Although I had been looking forward to the concert, I was just too tired to go."
Generally, a comma doesn't go after an independent clause if a dependent clause follows it. The only exception is when there is extreme contrast. We can see extreme contrast in this sentence, which is why the comma is correct. The contrast is that I was excited to go to the concert, but I didn't go because I was tired.
