Sentence Correction

Though the term ＂graphic　design＂may　 suggest　laying　out corporate brochures and annual reports，they have come to signify widely ranging work,　from package designs and company logotypes to signs，book jackets，computer graphics．and film titles．
(A) suggest laying out corporate brochures and annual reports，they have come to signify widely ranging
(B) suggest laying out corporate brochures and annual reports，it has come to signify a wide range of
(C) suggest corporate brochure and annual report layout，it has signified widely ranging
(D) have suggested corporate brochure and annual report layout，it has signified a wide range of
(E) have suggested laying out corporate brochures and annual reports，they have come to signify widely ranging

OA B
my questions
1. what is wrong in using "it has signified" over "has come to signify".. OG explanation says "it has signified" is a completed action.. but I thought by using "has" the effect is still there
2. what is the difference between wide range and widely ranging[/u]