The pilot made an unexpected ______ because of engine trouble.

A. the massacre of 200 pro-democracy protesters
B. many tragic outcomes of U.S. Korean cross-country marriage
C. sexual assaults on Korean prostitutes
D. American servicemen’s behaviour in South Korea

A. includes all forms of sales appeals to the prospective buyer
B. is produced mainly for newspaper or television
C. is an activity by which real products are shown to buyers
D. uses post as a chief means to contact prospective buyers