Which One of the Following Statements About Learning Curves Is

Which one of the following statements about learning curves is FALSE?

A) The direct labor for the n+1st unit will always be less than the direct labor required for the nth unit.
B) The reduction in time will follow an exponential curve.
C) A benefit of learning curves is that they are unaffected by factors such as product complexity and the rate of capital additions.
D) The cumulative average number of direct labor hours per unit for a given product after the tenth unit with an 80 percent learning rate will be less than that for the same product with a 70 percent learning rate.