I have a retirement plan with my employer. my code on my W2 is D. does that fall under traditional ira or roth ira? im not sure what to choose?

[DoninGA]

If you are referring to box 12 on the W-2 with a code of D -

Elective deferrals to a section 401(k) cash or deferred arrangement.  Also includes deferrals under a SIMPLE retirement account that is part of a section 401(k) arrangement

That is not for an IRA.  You do not enter your contributions anywhere else on the tax return, they already have been entered on the W-2.