Read the dialogue: Person A: I arrived late to work yesterday because of ...

Read the dialogue:

Person A: I arrived late to work yesterday because of the traffic.
Person B: I understand. It is so difficult to be on time anywhere when the traffic is bad.
Person A: Once I move closer to work, this will not happen again. I need more quality of life.
Person B: You are totally right.

Based on the dialogue, how many subordinate clauses did we find in it?