conmisdosmanos
Like many other theropods discovered in the Yixian Formation, a coat of filamentous structures was preserved with the fossil skeleton, which are commonly recognized as the precursors of feathers.
(A) a coat of filamentous structures was preserved with the fossil skeleton, which are commonly recognized as the precursors of feathers.
(B) the fossil skeleton had been preserved with a coat of filamentous structures, which are commonly recognized as the precursors of feathers.
(C) the fossil skeleton was preserved with a coat of filamentous structures commonly recognized as the precursors of feathers.
(D) a coat of filamentous structures, which are commonly recognized as the precursors of feathers, had been preserved with the fossil skeleton.
(E) a coat of filamentous structures, commonly recognized as the precursors of feathers, was preserved with the fossil skeleton.
+1 for C.Here is the explanation:
(A) a coat of filamentous structures was preserved with the fossil skeleton, which are commonly recognized as the precursors of feathers.-->
Wrong. Here ‘which are’ written after the comma wrongly modifies the skeleton.Hence it is wrong.(B) the fossil skeleton had been preserved with a coat of filamentous structures, which are commonly recognized as the precursors of feathers.-->
The introduction of ‘had been’ is incorrect.(C) the fossil skeleton was preserved with a coat of filamentous structures commonly recognized as the precursors of feathers-->
Correct.
(D) a coat of filamentous structures, which are commonly recognized as the precursors of feathers, had been preserved with the fossil skeleton.-->
The introduction of ‘had been’ is incorrect.(E) a coat of filamentous structures, commonly recognized as the precursors of feathers, was preserved with the fossil skeleton.-->
Wrong. Its the other way around. i.e. to say it is not the skeleton that acts as a coat of filamentous structures, rather it is the filamentous structures that provides a coat to the fossil skeleton.