Answer:
Using the power of social media means that Alex can Crowd source advice on Twitter ( c )
Explanation:
Crowd source advice on Twitter: Crowd sourcing is a valid means of obtaining insight/information about a project to be undertaken by an individual or entity and this task is performed on the internet and since Alex wants to make use of the power of social media crowd sourcing on Twitter is a sure way to get whatever information he seeks.
Doing a google search is also a means of sourcing information but Google search ain't a social media network. sending everyone he knows text message is not an economically viable option. as with option A Alex won't get the kind of information he seeks
