Step 1: Break the etymology.
{Anomalos} = {an-} (not) + {omalos} (even, regular).
Step 2: Apply the parts.
Thus “abnormal” literally means “{not regular/even},” where the meaning of {omalos} is “regular/even”; the prefix negates it.
Step 3: Conclude.
\[
\boxed{\text{‘Omalos’ = regular/even (Option B).}}
\]