People Who Force Themselves to Eat Everything on Their Plate

People who force themselves to eat everything on their plate at a restaurant, regardless of how full they might feel, likely do so because they:

A) gain negative utility from insulting the chef.
B) overvalue the opportunity costs of their health and time involved with eating food they don't really want.
C) consider the sunk cost of their meals when making their decisions.
D) undervalue the true benefit of eating too much.