B. must be related.
The main point of having a thesis statement is to explain the certain topic. Topic Sentences are sentences that explain how the topic is related to your thesis statement so it must always be relevant.
D becasue it has proper grammer
In College there is fraternities and sororities that use greek lettering. Movies and books like Percy Jackson or Clash of the Titans are also from greek stories. People love eating Greek Yogurt.
Our Solar System has nine major planets. Only one is knows to have intelligent life.
Or if it must be in one sentence:
Our Solar System has nine major planets, but only one is knows to have intelligent life.