单选题 Many individuals opt for "snake oil" because they ______.

A、 are misled by a secret formula
B、 cannot afford a treatment
C、 lack medical knowledge
D、 do not trust physicians

【正确答案】 A

【答案解析】[分析] 细节题型。参看第三段第二句...a salesperson who says that several bottles of a secret formula“snake oil”will cure not only cancer but tuberculosis as well, some individuals will opt for“snake oil”．