Answer: Choice B
If point B does not bisect line segment AC into two congruent segments, then point B is not the midpoint.
Reason
The template of a conditional is "If P, then Q". P and Q are placeholders for logical statements. A logical statement is something that is either true or false.
The inverse template would be "If not P, then not Q". We negate each part.
For example, the conditional "if it rains, then it's wet outside" has the inverse "if it doesn't rain, then it's not wet outside". We use this line of thinking to get the answer shown above.