There is no other relevant drop-down option for Box 14. Since it is not taxable, no adjustment occurs on your return by choosing tax-exempt. Therefore, this has no effect on your tax returns. If you feel more comfortable using Other (not classified), then you can use that as well.
For more information, please see the discussion What is a 414(h)?
@Wedge
[Edited 3/12/21 l 10:03AM PST]
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