Answer:
C. Food journal
Step-by-step explanation:
Positive reinforcement is when a reward is offered to encourage the desire to have repetition of certain behavior. With regards to the above, food journal is the correct answer because it assist to identify people's eating habit and patterns which in turn provide directions to adapt to healthy eating habit.
Food journal is basically used to support and achieve change. For example, one can track daily eating and drinking habit through the use of common household measurements like tea spoon and cup, to know the portion of foods and drinks to be taken.