Answer: D

Reasoning: A lateral (buccal) force at the mandibular angle bends the bone, making the medial cortex the concave side of the bend; the concave side is where compressive stresses concentrate, while the lateral cortex becomes the convex, tension side. Similar bending behaviour has been shown experimentally in long bones and mandibular models, where lateral surface loading places the medial cortex in compression and the lateral cortex in tension [Blatter & Weber 1990, PMID 2073452; Manley et al. 1982, PMID 7073450].