Final answer:
Inferior alveolar block requires anesthesia to be injected into the lateral wall of the oral cavity at a point before the sensory nerve enters the mandibular foramen.
Step-by-step explanation:
When performing an inferior alveolar block to numb the lower teeth, the anesthesia is injected into the lateral wall of the oral cavity at a point prior to where the sensory nerve enters the mandibular foramen. The mandibular foramen is located on the medial side of the ramus of the mandible. Therefore, the correct answer is (d) Mandibular ramus, medial pterygoid.