Dropping a class vs. grade B/C in tough AP

Thanks yes I am definitely willing to work hard but just have a week to decide whether I drop or continue the class. I am just worried if I make a B in first semester is that a bad thing for top colleges? I will definitely put in all it takes for Sem 2 but just trying to understand pros and cons of dropping vs. continuing and showing the progression. The teacher is willing to help me and is very understanding and wants me to succeed.