I think that It is C, adverb clause
A) because it is a sentence fragment and there needs to be "and" in between the two sentences.
Answer:
Step 1: Express Remorse. Every apology needs to start with two magic words: "I'm sorry," or "I apologize." This is essential because these words express remorse over your actions. ...
Step 2: Admit Responsibility. ...
Step 3: Make Amends. ...
Step 4: Promise That It Won't Happen Again.
Explanation: