Marketers Working for the Department of Health Were Surprised to Learn

Marketers working for the Department of Health were surprised to learn that a message stating that "cycling burns hundreds of calories" led to lower levels of cycling,You laugh because you know that ______,

A) message impact can reflect changes in beliefs not targeted within a message
B) McGuire's stages of processing show how difficult it is to elicit behavior change
C) Reactance Theory predicts a negative impact of such messages
D) the message makes cycling seem too easy