According to the situation, they found three different to the problem.
A. means
B. approaches
C. ways
D. methods
网友回答
A. means
(答案→)B. approaches
C. ways
D. methods
解析：考查近义词辨析。means 方式，手段，approaches方法，常与介词to 连用，ways方式，方法，methods方法，常用于学习方法，教学方法等，根据语境所以选B。