It shouldn't matter which type of retirement savings plan you indicate that you contributed to. There are multiple choices because they all have different rules to determine how much you can contribute. The program asks so that it can calculate the maximum contribution and/or determine the amount that you contributed is allowed. The amount of the contribution then flows to line 16 on p.2 of Schedule 1 (Form 1040), and from then it is included on line 10 of Form 1040. If your contribution to your UK pension plan is a qualified contribution, then that is where it should be reported. You should make sure that the amount you put for your contribution meets the guidelines for the type of plan you indicate.
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