As someone who works at a university, the best argument I would say you can make is to point to other classes that cover more advanced content where you have better grades, and see if that helps your case.
If he says no, you can go higher - department head then the dean of the faculty. They all have the right to say no, and the reasoning is that a D shows you did not acquire enough knowledge to pass the course clearly, and that knowledge deficit could hurt progression in that class. So use an argument around other good results in similar classes and hope for the best.
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