15. Significant sexual dimorphism is often found among bird species. Among the European flycatchers of the genus Ficedula, females select their mates based on the appearance of the conspecific male. Males look similar in allopatric populations of Ficedula hypoleuca and F. albicollis (European flycatcher). However, in the sympatric populations, males of the two species look very different. In experiments, females do not select males of other species when selecting between males from sympatric populations. However, they frequently make mistakes when selecting males from allopatric populations. This is an example of_________. (A) adaptive radiation (B) Batesian mimicry (C) character displacement (D) Müllerian mimicry (E) reinforcement