My science gpa was pretty good, but I had C's in English 101 and 102, and algebra.
I retook English 101 to prove I could have earned a better grade (A) if I had tried. I also earned an A in trigonometry, calculus, and physics, indicating I was capable of better than a C in math courses.
While this isn't a recommended path to pharmacy school, it's proof that a C won't kill your dream. Also, just my opinion, if you have a C or C's on your application you need to make yourself stand out more than other applicants in other aspects to level the playing field. I believe my EC, experience, and work history really helped my application.