I'm going with 8 or B.
I assume if it were a 9, it would resemble the 6, (reversed, of course), and the curves are very different from the 6.
And, there's a little downward tail at the left end of the crossbar that could only be part of an 8 or an uppercase B.
The curve at the top left is not smooth, but appears to have a slight corner, which would make me lean towards B.