OG12 SC 136

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136. Whereas in mammals thetiny tubes that convey nutrients to bone cells are arrayed in parallel

lines, in birds the tubes form arandom pattern.

(A) Whereasin mammals the tiny tubes that convey nutrients to bone cells are arrayed inparallel lines, in birds the tubes

(B) Whereas the tiny tubes for theconveying of nutrients to bone cells are arrayed in mammals in parallel lines,birds have tubes that

(C) Unlike mammals, where the tiny tubesfor conveying nutrients to bone cells are arrayed in parallel lines, birds’tubes

(D) Unlike mammals, in whom the tiny tubesthat convey nutrients to bone cells are arrayed in parallel lines, the tubes inbirds

(E) Unlike the tiny tubes that conveynutrients to bone cells, which in mammals are arrayed in parallel lines, inbirds the tubes

A 选项后面句子不完整、是一个省略吗？