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Which tone best fits a business letter

Which of these sentences exhibits proper usage? a. many doctors affiliated with university hospital expressed concern about the policy (moore 5). b. many doctors affiliated with university hospital expressed concern about the policy (moore 5). c. many doctors affiliated with university hospital expressed concern about the policy (moore 5). d. many doctors affiliated with university hospital expressed concern about the policy (moore 5).

Which phrase best describes the role of irony in a written book? a. to validate readers’ beliefs b. to defy readers’ expectations c. to represent an idea d. to dramatize events apex