Consider a Firm That Uses Only Labour and Capital as Inputs.At

Consider a firm that uses only labour and capital as inputs.At the present use of labour and capital,the MP of labour is four times the MP of capital,and the price of labour is twice the price of capital.In order to minimize its costs,the firm should

A) decrease capital and increase labour.
B) decrease both capital and labour.
C) stay at its present factor mix.
D) substitute capital for labour until their marginal products are equal.
E) increase both labour and capital.