People often complain about the amount of bad news in newspapers and news broadcasts. Systematic studies have shown that （ ）

A、peopleunderstatetheamountofcrimenewsinthemedia.
B、peopleunderstatetheamountofupbeatnewsinthemedia.
C、peopleexaggeratetheamountofcrimenewsinthemedia.
D、peopleexaggeratetheamountofupbeatnewsinthemedia.