Darla has sent out a survey in which she is asking people to provide information about their attitudes on a number of sensitive subjects. when the surveys are returned, darla needs to be aware that the responses may be distorted due to

Self-report biases is the correct answer.

Explanation:

Sel-reporting is a method that asks participants to answer the researcher's questions (Darla, in this case) without the researcher's interference. It is applied on questionnaires, surveys, interviews, and others. In this situation, Darla must be aware that self-report biases may distort the people's answers.