Research shows that tipping in a restaurant has little to no effect on service. What tipping does do is enable restaurateurs to pay less than the federal minimum wage to servers and depend on customers to make up the difference between servers' salaries and the minimum wage. The U.S. federal minimum wage for servers is $2.13 per hour. Although minimum wage varies from state to state, it is safe to say that customers are paying the lion's share of servers' salaries. This practice leads to resentment on the part of customers, and it devalues servers. It's time to abolish tipping and pay employees a living wage. The result may well be happy servers who provide excellent service to grateful customers.   Which of the following is the writer's main argument?

A. Barton works on the frontlines of the Civil War.

B. Barton travels to Europe.

C. Barton identifies anonymous soldiers.

D. Barton works as a federal patent clerk.

A. Beating egg whites means stirring them vigorously.

B. Folding in peanut butter must be done with an electric appliance.

C. These cookies can be cooked in a microwave oven.

D. These cookies should be cooled on a baking rack.

A. A

B. B

C. C

D. -