Answer: B) Evaluation apprehension
Explanation:
Evaluation apprehension is the concept in which it is believed that working on a task with other people can raise concern how will those people think of work may improve or degrade performance.
According to the question, Sarah's situation is describing evaluation apprehension as she has concern what jury will think about her speech which impacts in degradation or enhancement of her speech performance.
Other options are incorrect because self-serving bias, risky shift and altruism is not impacting performance of Sarah.Thus, the correct option is option(B).