문장간략화 문제인데 보다가보다가 이해가 안돼서 질문드립니다...
In cases where populations have
geographical boundaries, differences in song may appear, and if these
geograpical limits are distinct, the shared song types within a population are
referred to as dialects.
A. Dialects are those song types within a
population that are shared by the group.
B. Shared song types within a population
with clear geographical boundaries are called dialects.
C. Geographical boundaries may result in
differences in song between distinct populations.
D. Populations having clear dialects result
from the shared song types within the group.
여기서 B가 정답인데 아무리 하나하나 분석해도 다 말이 되는 것 같아서 질문드립니다... 왜 B가 정답이고 나머지가 오답인지 가르쳐주세요.. 도와주세요.... 그리고 C번은 어떻게 해석하나요...