Which sentence contains a punctuation error?

A.

Why do I have to memorize Psalm 23 1-6?

B.

I'm usually busy until about 4:30 P. M.

C.

Are you familiar with Genesis 1:1?

D.

Did she mean 7:00 A. M. or 7:00 P. M.?

In my opinion there is an error in B. I'm usually busy until about 4:30 P. M. It's a mistake in "until about". You should to delete word "about". Or before about put "in" and clear "until". No matter, but "B" is the only right answer.