问题
单项选择题
If no distress acknowledgement is received（）a DSC distress call transmission, then the ship in distress may repeat the DSC distress call attempt after a delay of between 3.5 and 4.5 minutes from the beginning of the initial call.
A.relevant to
B.relate to
C.in response to
D.in relation to
答案
参考答案：C