GmatKiss wrote:Unlike most warbler species, the male and female blue-winged warbler are very difficult to tell apart.
(A) Unlike most warbler species, the male and female blue-winged warbler are very difficult to tell apart. ---- Apple to Apple comparison i.e most warbler species is being compared with the male and female blue-winged warbler
(B) Unlike most warbler species, the gender of the blue-winged warbler is very difficult to distinguish. ---- wrong comparison
(C) Unlike those in most warbler species, the male and female blue-winged warblers are very difficult to distinguish. ----- wrong comparison
(D) It is very difficult, unlike in most warbler species, to tell the male and female blue-winged warbler apart. ----- unnecessary fragmentation
(E) Blue-winged warblers are unlike most species of warbler in that it is very difficult to tell the male and female apart ----- awkward

Confused with the OA, can someone explain pls!

sl750 wrote:B

Jim@Grockit wrote:Hah! Honestly I'd have chosen C or E, because the others aren't even comparisons. You can't compare gender to species, or male and female birds to a whole species.

GmatKiss wrote:Unlike most warbler species, the male and female blue-winged warbler are very difficult to tell apart.
(A) Unlike most warbler species, the male and female blue-winged warbler are very difficult to tell apart.
(B) Unlike most warbler species, the gender of the blue-winged warbler is very difficult to distinguish.
(C) Unlike those in most warbler species, the male and female blue-winged warblers are very difficult to distinguish.
(D) It is very difficult, unlike in most warbler species, to tell the male and female blue-winged warbler apart.
(E) Blue-winged warblers are unlike most species of warbler in that it is very difficult to tell the male and female apart

Confused with the OA, can someone explain pls!