The explanation for the general weakness in commodity prices is&

The explanation for the general weakness in commodity prices is complex.
A、simple
B、apparent
C、complicated
D、abstract
【正确答案】：C
【题目解析】：complex 复杂的，难懂的 ；simple简单的；apparent明显的；complicated 复杂的，混乱的；abstract抽象的；故选C。