How valuable a low-cost leader's cost advantage is depends on

A、 whether it is easy or inexpensive for rivals to copy the low-cost leader's methods or otherwise match its low costs.
B、 how easy it is for the low-cost leader to gain the biggest market share.
C、 the aggressiveness with which the low-cost leader pursues converting the cost advantage into the absolute lowest possible costs.
D、 the leader's ability to combine the cost advantage with a reputation for good quality.
E、 the low-cost leader's ability to be the industry leader in manufacturing innovation so as to keep lowering its manufacturing costs.