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

Select one:

a$.$ The factors that lead consumers to buy a product are beyond the tools of social media analytics to identify and quantify.

b$.$ The criteria used for choosing the most suitable method of promoting a product is now an exact science.

C$.$ The level of buzz created for a product rightly reflects the product's effectiveness.

d$.$ The input of many people $($rather than of a few experts$)$ is leveraged to make decisions.

Clear my choice