The correct answer is: B. Nervousness
The correct spelling of the word is "nervousness".
- Remarkable is spelled correctly. It means "worthy of being noticed or remembered; striking or unusual".
- Ambition is spelled correctly. It means "a strong desire to achieve something".
- Difference is spelled correctly. It means "the state of being unlike or dissimilar".
The word "nervousness" is spelled incorrectly. It should be spelled "nervousness".