Answer:
There are many stories that wouldn't match this. I'd say most would be A, but many could be B or D too. I understand why'd you be so confused. I'd go with A. How many times do you hear "Happily Ever After", just saying.
The material should not be A.) Biased. because speeches are directed at everyone, not just one certain type of people.
1. The whole class laughed loudly at the story.
complete subject: the whole class
complete predicate: laughed loudly at the story
2. The whole class laughed loudly at the story.
simple subject: class
simple predicate: laughed
3. Twelve hours passed without a word from any of the group.
simple subject: hours
simple predicate: passed
4. The workmen repaired the dam.
complete subject: the workmen
complete predicate: repaired the dam
Answer: Know what you are talking about, know when it is the right time for you to talk, have materials/ notes on hand, be confident (but not overly confident), and stay calm
Explanation: