The manager of the department had _____ his friend's advice, which led to the failure of his business. [ ]

A. concerned

B. suffered

C. ignored

D. discussed

在各类购买行为中，寻求多样化购买行为的特征是（）。

A．消费者介入程度低，品牌差异小 

B．消费者介入程度低，品牌差异大 

C．消费者介入程度高，品牌差异小 

D．消费者介入程度高，品牌差异大