Answer: b) to eat
‘Phagia’ is a term derived from Greek that relates to eating or the act of swallowing. In medical terminology, it is often used as a suffix in words that describe various eating disorders or conditions related to swallowing, such as ‘dysphagia,’ which indicates difficulty in swallowing. The other options, including vomiting, the common bile duct, the abdominal wall, and lips, do not align with the definition of ‘phagia.’ Therefore, the correct answer is b) to eat.