In a buying center, affect the buying decision, usually by helping define the specifications for what is bought.

Influencers, is the right answer.

Explanation:

In the business-to-business context, all the decisions for buying are made in groups. This group which play an active role in buying decision in a company is called the Decision-Making Unit or DMU. The term buying centre is used to refer to a group of a company which decided the purchase of a good or service for the entire company. Users, influencers, buyers, deciders and gatekeepers are the five main roles in a buying centre. The one who tries to affect the final decision with their opinion is called the influencer.

b. a single paragraph.

a paragraph is a series of sentences that are organized and make sense, and are all related to a single topic . almost every piece of writing you do that is longer than a few sentences should be organized into paragraphs. this is because paragraphs show a reader where the subdivisions of an essay begin and end, and thus the reader see the organization of the essay into subjects in order to be able to understand its main points.

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