Looking up the word in the dictionary
I believe its five -The Romance Stage
The Power Struggle Stage
The Stability Stage
The Commitment Stage
The Co-Creation or Bliss
D. is wrong. It should be "One hero in the animation field is Mel Blanc, the voice behind many cartoon characters." because the information after Mel Blanc is not necessary to the sentence. It's just extra, so you need a comma.
The Forum served as a stage for Roman politicians and philosophers. It was a sort of a square where people gathered to hear these politicians and philosophers speak.
