选出与音标内容相符的正确句子。
/ wen wi: ə'raɪvd ðer ɪk 'spresd ðeə 'ri:zn fɔr li:vŋ /
A . When we arrived, they explained their reason for leaving.
B . When we arrived, they expressed their reason for leaving.
C . When we arrived, they explored our reason for leaving.