Understanding Context Clues in Sentence Completion

Elena was preparing for the annual science fair at her school. She was quite passionate about her project, which involved creating a small solar-powered model car. However, she faced a dilemma because her model wasn't functioning as she had hoped. Despite her efforts, the car would not move, leaving her feeling quite ______. While she enjoyed the challenge, the stress of the upcoming deadline was becoming increasingly overwhelming.

To help alleviate her worries, she decided to seek assistance from her friends. Together, they brainstormed ideas and offered suggestions to improve her design. By collaborating, Elena felt a renewed sense of optimism, knowing that she might still be able to complete her project on time.