Which Statement Is True of the Outcome of Crowdsourcing When

Which statement is true of the outcome of crowdsourcing when using social media in marketing?

A) The input of many people (rather than of a few experts) is leveraged to make decisions.
B) The level of buzz created for a product rightly reflects the product's effectiveness.
C) The criteria used for choosing the most suitable method of promoting a product is now an exact science.
D) The factors that lead consumers to buy a product are beyond the tools of social media analytics to identify and quantify.