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A- wrong comparison between warbler species and male and female
B- Same as A wrong comparison
D- blue-winged warblers- plural to be used
For me C and E are closest
C: apparently those refers to the male and female. I may be read like this
Unlike the male and female in most warbler species, the male and female blue-winged warblers are very difficult to distinguish. perhaps one needs to use "the male and female of blue-winged warblers:.... quite confusing
E- I feel to make this sentence correct, we need to add "as"after the "unlike most species of Warbler" and then followed by rest of the sentence ...in that....