Question

which behavior is always a cultural behavior?
eating
shaking hands
breathing
blinking

Explanation:

Cultural behaviors are learned and vary across societies. Eating can have cultural aspects but is also a biological need (e.g., basic survival eating). Breathing and blinking are involuntary, biological functions. Shaking hands is a learned social/cultural greeting ritual that differs by culture (e.g., some cultures bow or hug instead), so it's always a cultural behavior.

Answer:

B. shaking hands