A recent study of ancient clay deposits has provided new evidence <supporting the theory of global forest fires ignited by a meteorite impact that> contributed to the extinciton of the dinosaurs and many other creatures some 65 million years ago.

(A)ditto
(B)supporting the theory that global forest fires ignited by a meteorite impact
(C)that supports the theory of global forest fires that were ignited by a meteorite impact and that
(D)in support of the theory that global forest fires were ignited by meteorite impact and that
(E)of support for the theory of a meteorite impact that ignited global forest fires and

正解は、(B)ですが、なぜ（A）はだめなのでしょう？

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