Routine replies and positive messages should close with

Routine replies and positive messages should close with the information that highlights and shows a benefit to the audience.
Your message will probably succeed in the event that it leaves your readers with the inclination that you have their best advantages as a main priority and you can achieve this by featuring an advantage to the audience or by communicating gratefulness or generosity.

A. would be the correct answer because when african americans moved from there to kansas they worked for the people they lived with

Clean air provides nitrogen