Final answer:
The masseter and temporalis muscles are responsible for elevating the mandible, playing a key role in the process of mastication, or chewing.
Step-by-step explanation:
The muscles responsible for elevating the mandible are the masseter and temporalis muscles. Both of these muscles play a crucial role in the process of mastication, which is the technical term for chewing. The masseter is the primary muscle used for chewing as it elevates the mandible to close the mouth, while the temporalis muscle assists by retracting the mandible.
Alongside these, the medial and lateral pterygoid muscles also aid in chewing by moving the mandible side to side, although they aren't directly responsible for its elevation. The correct answer to the question is 1) Masseter and temporalis.