Which common topic is being used when a popular tennis player endorses a specific tennis racket brand? a. definition b. division c. relationship d. testimony

It is well known that the professional tennis payers are getting endorsements to advertise a specific brand of tennis racket, even though they actually use their old and comfortable tennis racket. Often the old ones get a paint job with the logo of the endorsed ones. The tennis players however have to give testimonies of how well they like playing with a certain type of racket so that their fans can buy these.  

Question: Which common topic is being used when a popular tennis player endorses a specific tennis racket brand?

D. Testimony

today we'd use social media to quickly spread a controversial idea, but in the eighteenth century, the printed pamphlet was highly effective. and thomas paine took full advantage of it. on january 9, 1776, when paine published his pamphlet, "common sense," he wanted to push the american people toward independence from britain. it ultimately ignite the american revolution. thomas paine argued that the monarchy was evil and should be rejected as a form of government. to underscore his point, he cited the bible to argue his case -- in judges 8: 22-23: "the israelites said to gideon, 'rule over us, you and your son and your ' gideon told them, 'i will not rule over you. the lord will rule over you'" (nrsv).

the answer is academic paper

and the second should be college professor