The growth projected for these storms in different computerized weather models varies widely.
(A) projected for these storms in different computerized weather models varies widely
CORRECT-not sure if the placement of 'for these storms' is ideal though...someone can hopefully chime in
(B) for these storms is projected in different computerized models of weather
to vary widely-use of infinitive here is wrong
-vary is plural, growth is singular
(C) of these storms, projected in different computerized weather models,
vary widely
-vary is plural, growth is singula
(D) projected for these storms,
which vary widely in different computerized weather models
(E)
that varies widely for these storms
are projected in different computerized weather models
-restrictive modification with 'that' is awkward
-more importantly, there is a subject-verb disagreement