The noun clause that completes the sentence and makes it grammatically correct is what I want to do in the future.
Teaching is what I want to do in the future.
Explanation on how to answer:
Read the story and figure out whats missing. Without the whole story, no one can tell you what important part is missing. Find the section that that excerpt is from and see what the differences are, or post the full story.
Answer:
She would feel that it is important to stand up for what you believe for and in her case this would definitely be something she would feel that she needed to stand up for.
Explanation: