Question

multiple-choice question
the two categories of skull bones are...?
frontal and occipital bones
cranial and facial bones
cranial and skull bones

Explanation:

The skull is divided into two main groups: bones that form the protective cranial vault (cranial bones) and bones that make up the facial structure (facial bones). Frontal and occipital are individual cranial bones, not categories. "Cranial and Skull bones" is redundant as cranial bones are a subset of skull bones.

Answer:

Cranial and Facial bones