Which section of this passage is an example of a dependent clause?

The last day of school is always an amazing day for my friends and me. First, we eat at our favorite pizza restaurant. Then, after we've stuffed ourselves, we go to the bowling alley. After bowling a couple of games, we head to the movies for the latest horror movie. If we still have time left, we head back to the pizza place for more food.
A. The last day of school is always an amazing day
B. Then, after we've stuffed ourselves
C. we go to the bowling alley
D. we head to the movies

Dependent clauses are those group of words that cannot stand on it's own, meaning they don't make complete sense. So, in order to be fully understood to make any meaningful sentence, they join anther group of words to be made whole. So, in the above passage, "Then, after we've stuffed ourselves" is the dependent clause as it can't or doesn't make any sense on it's own. Joining with other words, it only makes sense. All the other options can stand on their own, making perfect sentences.