Don't think it's D. Only C has political affiliation, which you legally can't use for discrimination in hiring. The others are regulated but can be checked if there's a legit job reason. Pretty sure that's what exam practice questions say, but let me know if I missed something obvious.
Had something like this in a mock, it's C. Only political affiliation is never okay as a background check factor, everything else can be checked with proper justification. Pretty sure about this, but let me know if you read it different.
C or D? I thought D because criminal records sometimes can't be used for certain jobs depending on state law, but now I'm second guessing. But yeah, political affiliation in C is usually protected so maybe that's the one they want. Not totally sure, open to correction.