The situation of Shelia shows the external locus of control in her overweight. Thus, the correct answer is C.
External locus of control refers to a situation where a person thinks that the outcome of situation is affected by external factors which are not controllable. This will stop them to try to achieve their goals.
In this situation, Shelia believes that she is overweight and can't lose it because of her family history which shows an external locus of control. She had try some diets but was unable to achieve her goal of losing weight due to external factors.
Therefore, option C external locus of control is the correct answer.
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