In order to encourage participation in a walkathon, the organization arranging the event offers free items, such as a T-shirt or a water bottle, to all the participants. Which of the following principles of influence is being used?
A. liking
B. authority
C. scarcity
D. reciprocation
E. social proof

The correct answer is letter "E": social proof.

Explanation:

In marketing, Social Proof is nothing more than a demonstration of the use of a product or service by a group of people so others can be encouraged to purchase it. Social proof has proven effectiveness as a way to influence others and every time on the internet and social media it tends to facilitate businesses more leverage more over at the moment of introducing goods in the market so more people are willing to buy those products or services.

the correct answer option is b. a single paragraph.

explanation:

when you are thinking about paragraph​ topics, you should always choose a subject that can be adequately addressed in a single paragraph.

a paragraph is a piece of writing consisting of a few sentences that deal with a single theme. it has only a single idea that the paragraph revolves around and talks about.

so a paragraph topic must be chosen wisely where a single idea can be communicated in a single paragraph.