They are short- to medium-range, narrow-body jet airliners.

They are short- to medium-range, narrow-body jet airliners.
A.它们是一种比较短的小体积喷气式客机。
B.它们是中短程窄体喷气式客机。
C.它们是中短距离的喷气机。
D.它们是短航程的宽体直升机。
正确答案：它们是中短程窄体喷气式客机。