Related run ended at the A30, that's why you have a bag on that spot. Foul was behind the basic spot, enforce from the A28.
So in a), B's choices are enforce and have 2nd down from the A14, or decline and A has a 1st down at the A10. Clock on the the RFP, (A-B-A).
In b), enforce and 2nd down from the A14. Clock on the RFP.