单选题 Nowadays the doctors are trying their best to reduce the people's fear ______ they would be affected by the present disease called "Bird Flu" (禽流感) .

【正确答案】 C
【答案解析】fear后为同位语从句。在同位语从句、表语从句、主语从句中的引导词that一般不省略，故选C。