Nuke Eligibility

Hi I’ve been interested in the nuke careers for a while and I was talking with my recruiter today and he mentioned that if I had ever received a D grade in a math class(which I have) that I wouldn’t be eligible anymore.

Is this true?
If so is there any work arounds?

I received an asvab score of 82 and a nuke line score of 241

Any information is appreciated