Which of the Following Better Explains 'Influencers

Which of the following better explains 'Influencers'? 

A)  Those who control the flow of information from the supplier towards the other members of the Decision Making Unit (DMU) . 
B)  Those who are able to affect the outcome of the purchasing process by means of solicited or unsolicited advice. 
C)  Those who can influence the media. 
D)  Those suppliers that meet the buyer's prequalification criteria and that will be requested to submit a first proposal.