Do be aware that most schools that has the AB or BC option will have some sort of grade cutoff and/or teacher recommendation before you can go into AP Calc BC. At my kid’s HS you needed a B+ or higher in your second semester for PreCalc H in order to get in. Some schools require some sort of A in PreCalc in order to get in.
But if you do qualify for BC you generally have the choice of going to AB also, though that might be admissions suicide for some schools.