Billy: I've been fixing the computer for over three hours, but it still doesn't work.

Nana: Why don't you take a rest and try ______? Maybe you'll do better then. [ ]

A. early

B. finally

C. later

D. once

对不符合操作性前提方案条件下生产的产品，以下说法正确的是（）

A.应为潜在不安全产品

B.应按潜在不安全产品进行处理

C.应评价不符合的原因和对食品安全可能造成的后果，必要时按潜在不安全产品进行处理

D.经原因分析，按不合格品进行处理