After long years of indifferent reception by the scientific community, Barbara McClintock's subtle work on the genetics of corn has now been acknowledged to be of major importance; her analyses show that movable elements control the action of genes and thus cause mutations.

(A) Barbara McClintock's subtle work on the genetics of corn has now been acknowledged to be of major importance

(B) Barbara McClintock's subtle work on the genetics of corn has now been acknowledged as being major

(C) it has now been acknowledged that Barbara McClintock's subtle work on the genetics of corn is major in importance

(D) there is now acknowledgement of Barbara McClintock's subtle work on the genetics of corn as of major importance

(E) the importance of Barbara McClintock's subtle work on the genetics of corn has now been acknowledged to be major