Randy's candies deals in confectioneries. it conducted a research on the consumption of its new sugary candy in a busy area of the city. many respondents, even if they were aware of the sugar candy, did not admit knowing about it to their interviewers. they even asked the interviewers to leave them alone. this reduced the accuracy of the survey this error is most likely an example of ________ a. measurement error b. frame error c. random error d. sampling error