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One by one:

1. No, but you must itemize your state deductions using Form MO-A - 2021 Individual Income Tax Adjustments.   

2. Yes, as far as Parts B and D.  For Part A, it may be deducted if they aren't covered under social security and they weren’t a government employee who paid Medicare tax.  This would be entered in Box 6Y or 6S of Form 5695 - Qualified Health Insurance Premiums Worksheet for MO-A, Line 12, as appropriate.

3. Yes, all can be claimed, and they’d be entered in Form 5695 as described above.