Social desirability is demonstrated as the kind of response bias in which the respondents' tendency of answering questions in a particular manner is considered advantageous by others.
In the second paragraph, the last statement explains how research proposes how 'the response over the internet is advantageous over other types of telephonic surveys or direct(face-to-face) interviews. The respondents are likely to provide socially admissible and authentic answers regarding sensitive topics like weight more during a telephonic or face-to-face interview than on internet. This shows the comparison aptly and the difference in social desirability on internet responses and the other responses. Thus, <u>option C</u> is the correct answer.
