Final answer:
Straight hair tends to hug the head shape more closely because it lacks the texture that adds volume, unlike curly, wavy, or frizzy hair that typically has more body.
Step-by-step explanation:
The hair type that generally hugs the head shape due to the lack of body or volume is straight hair. This is because straight hair does not have the bends or curls that can add volume and give the appearance of a fuller head of hair. In contrast, curly hair and wavy hair often have more body and volume due to their textured nature, while frizzy hair can appear voluminous but may be unruly and less defined.