End of Half w/ fouls

[tjones1]

2nd Quarter, 10 seconds remaining.
A's ball, 2nd & 10. A throws a pass that is intercepted by B84.

While B34 is running, A81 and B31 are flagged for personal fouls at the 50 (A81 committed the first foul).

Time expires as B84 runs to A's 5 yard line where he fumbles it into the end zone. A30 covers the fumble for a touchback.

What are the options?

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If B accepts, then A accepts: Untimed down; replay 2nd down, A's ball.

If B accepts, then A declines: Untimed down; B's ball 1st & 10 from A's 35 yard line.

If B declines, then A accepts: Untimed down; B's ball 1st & 10 from B's 35 yard line.

If B declines, then B declines: Play stands. End of half.

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Right, wrong, not even close?