The law of variable proportion state that if the quantities of variable factor of production are used with fixed factor, after a certain point, ____________
A. each successive unit of the variable factor brings about a decreasing marginal product B. each successive unit of the variable factor bring about equal increase in marginal product C. each successive unit of the variable factor bring about an increasing marginal product D. each successive unit of the variable factor bring about four time increase in marginal product E. each successive unit of the variable factor bring about more than equal increase in marginal product
