a D is technically passing; it offers 1pt toward your GPA/GPR but thats not an ideal grade, you'll have to review your degree plan (on your major's department's website) and see for yourself. some majors will accept a D for a nonvital class, here is an example for the human resource development major:
http://eahr.tamu.edu/uploads/files/U...130-135rev.pdf
if you are a freshman, you can use a freshman exclusion, but that has its own set of consequences that you'll have to consult a financial aid advisor about