Right Enforcement?

[Mike L]

Common sense tells me you can rarely get in trouble by doing what the rule book tells you to do. As kdf5 pointed out, all the fundamental tells you to do is read the rules in question to get your answer. The wording of the applicable rule is pretty clear.
Did the rulesmakers intend for B to get a choice on live-ball A USC fouls during a score? I believe they did.
Did the ruleswriters word the rule to allow for that choice? Obviously not.
So, you can go with what everyone thinks they intended to do or go with what they actually did. I'm in the latter camp simply because I'm a believer in doing what the rules say (& I don't have to come up with some "story" to justify my call).