During the SARS (2003) and the H1N1 (2009) Pandemics Marketers

During the SARS (2003) and the H1N1 (2009) pandemics marketers seized the opportunity to make sales, based on the ________.

A) widespread use of social networks that facilitated the spread of information
B) fearful memories of previous pandemics
C) proven efficacy of many of their products
D) refusal to many people to use the far more effective vaccination