15 Easy Quant Questions - Confused on Answer

I chose answer D, since AB could be equivalent to the diameter as C can be a point on the diameter that’s not the center. Can someone explain how GregMat chose B?

and how is that possible if AB is not equivalent to the diameter? Remember that the line cannot be “bent” or anything like that.

You’re right. We made an error while creating the question, and we will fix it. Thanks for pointing it out!

Well, except that the question had already been changed before - but the video wasn’t updated. The answer is still B.

(I didn’t realise this, hence told Joan that it was an error. Apologies for this)