If your wage income is mostly or entirely from work done in CT, I would pick the second option, "My expected annual gross income is greater than $15,000".
The wording on the form could be clearer, but I think that the last option is for non-resident employees who work both within and without CT during the year. Such employees would want CT withholding only on the CT portion of their income.
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
