Say you got an F.

Well, I'll turn it into a B.

What if you got an E?

I can turn that into a B.

Sometimes you might get a D.

I'll turn it into a fine looking B.

C is average, so you probably used to get those.

You won't have to get C's anymore, because they make great B's.

What if you got an A that's messing things up?

Well, I can turn that into a B, too.

So you see. There is no reason to ever get anything other than B's.