As for your first question, write down F-1. If your I-94 contains a "D/S" you can only be out of status when the government has made a formal finding of status violation by you. As for your second question, mark option (a).
I'd put "none" - you have no legal status. Don't be concerned with this, though. Since you are applying for a green card as a spouse of a US citizen, you remain eligible despite being here without lawful status for the last 5 years. Be sure to consult an immigration lawyer to eliminate other issues that may preclude you from obtaining a green card.