23. (B)
It’s easy to see that the answer must be choice (A), (B), or (C), because the slope field depends
only on x: all the slope segments for a given x are parallel. Also, the solution curves in the slope
field are all concave up, as they are only for choices (A) and (B). Finally, the solution curves all
have a minimum at x = 2, which is true only for differential equation (B).