The correct answer is D. A prepositional phrase means that it starts with a preposition. And in these examples, D is the only one that starts with a preposition "on".
The answer would be (why)
8. Basketball is generally better than tennis. I chose this because the author picked basketball and its best qualities.
9. The boy and the old man are very poor, but they are happy it is referenced in the passage and Patrasche is the dogs name.
10. The old man and boy were never able to make enough food. They were poor and didn't have a big garden to grow an abundance of food.
That's my take on the questions, hope it helps you.
The purpose of the first paragraph of the Iroquois Constitution is let the readers and all people understand what their goal is. The goal if the constitution is peace. Appointing 5 leaders of the 5 nations great Lords as councils of the constitution.