Answer:
B Dialogue is more likely to contain sentence fragments.
Step-by-step explanation:
It cannot be A because dialogue can be focused on many things, not just abstract ideas. It cannot be C, because if you listen to a formal speech, it is not usually meant for children, as it is formal. It is not D because formal speech is formal due to the fact that it contains less errors and is more grammatically correct.
It is B because of the points above and the fact that when you speak, you are not in front of a computer that tells you your grammar mistakes.
This is an example of a sentence fragment: "I fell asleep. Although I was tired." When you say it out loud with the correct emphasis on the right words, it sounds correct, when in reality it is wrong.
This is my first time answering a question, I hope you do well.