(A) seem to be resistant to malaria,

(B) seemingly are resistant to malaria,

(C) seem to be resistant to malaria and have

(D) seemingly are resistant to malaria and to have（A）

(E) are, it seems, resistant to malaria, and they have

关于指代，到底是怎么样算是指代不清呢。A中an evolutionary advantage 可能指代malaria，不会引起歧义吗？

还有关于which的指代，是不是可以跳过先行词来指代核心词阿？

能不能和我讲讲关于指代的问题啊~~~

这里an evolutionary advantage ,整个前面半句话的同位语.
例如:China is becoming stronger and stronger, a phenomenon that

makes many western countries worried!

which的指代问题,要有具体的题来解释比较好.