Under which condition would a differentiation strategy be especially effective?

A、when the target market niche is large, profitable and growing;

B、when technological change is fast paced and competition revolves around rapidly evolving product features;

C、when industry leaders do not consider the niche to be crucial to their own success;

D、when the industry has many different niches and segments, thereby allowing a company to pick a competitively attractive niche suited to its own resources;

E、when few, if any, other rivals are attempting to specialize in the same target segment