I'm pretty sure it's C, it makes the most sense.
Explanation:
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I believe it is when it starts to melt
The behavior which would be most successful for changing her eating habits in order to lose weight would be asking for a box at the beginning of the meal to split the portion on her plate when eating out.
Behavior modification, a method based on the work of B.F. Skinner, is an approach that aims to change unneeded behaviors with more advantageous ones thru either negative or positive reinforcement.
The answer is D. Robert Cavelier de La Salle