Step 1: Mechanical asphyxia deaths differ mainly in where the compressing force lands. To answer, ask which technique drives force hardest into the muscles and structures of the neck itself.
Step 2: Throttling (manual strangulation) uses the bare hands. The grip is forceful and prolonged, and the fingertips dig deep, so the strap muscles get heavily contused and the hyoid bone frequently fractures. This concentrated crushing is why neck bruising is most marked here.
Step 3: Look at the other choices. A hanging ligature spreads load gradually as the body drops, sparing deep muscle bruising. Burking is smothering plus thoracic compression, so the neck is largely uninvolved. Smothering targets the mouth and nose, giving facial rather than cervical injuries.
Step 4: Comparing all four, the hands-on crushing of throttling produces the greatest soft tissue damage in the neck.
\[\boxed{\text{Strangulation (throttling)}}\]