One potential problem with self-report measures is
a. it is not possible to assess the validity of self-report measures.
b. they do not provide information concerning the direction of an attitude.
c. respondents might not respond truthfully.
d. respondents typically dislike them.

c) Respondents might not respond truthfully

Explanation:

A self-report measure is a type of survey, questionnaire or poll in which respondents read the question and select a response by themselves without interference from an interviewer or another person.

The main problem with this kind of measures is that there is a social desirability bias associated to them.

Social desirability bias refers to the tendency that participants have in which they often answer in a way to portray themselves in a good light, this means that they report what they think the researcher wants to hear and they make themselves appear better than what they actually are.

Thus, the main potential problem with self-report measures is that respondents might not respond truthfully.