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The least cost combination of factors x , y and z will generally be the point at which:

A. Price of x = Price of z Price of y Price of x

B. MP of x = MP of y Price of x Price of x

C. MP of x = MP of y = MP of z Price of x Price of y Price of z

D. MP of x = MP of y = MP of z

Please do not use chat terms. Example: avoid using "grt" instead of "great".