Step 1: Define dialectics.
Hegel proposed that historical and social change occurs through the dialectical process—thesis (existing state), antithesis (conflicting state), and synthesis (resolution).
Step 2: Contrast with Marx.
Marx adapted Hegelian dialectics to material conditions (historical materialism), but the triad of thesis-antithesis-synthesis is Hegel’s original philosophical framework.
Step 3: Conclude.
\[
\boxed{\text{Hegel (Option B) formulated the dialectical law of change.}}
\]