Which is the controlling idea of the article?

Responses
A The extra-long fibers make the ELS cotton very soft and strong fabric.The extra-long fibers make the ELS cotton very soft and strong fabric.
B Egyptian cotton with extra-long fibers is the finest quality of cotton.Egyptian cotton with extra-long fibers is the finest quality of cotton.
C Both Pima and Egyptian cotton are superior qualities of cotton.Both Pima and Egyptian cotton are superior qualities of cotton.
D The American Civil War expanded Egyptian cotton trade with Europe. The American Civil War expanded Egyptian cotton trade with Europe.

B Egyptian cotton with extra-long fibers is the finest quality of cotton.