To save the drowning child，the boy plunged into the icy water without hesitation， his own safety．
A. despite of
B. regardless of
C. unaware of
D. because of
网友回答
A. despite of
(答案→)B. regardless of
C. unaware of
D. because of
解析：考查短语。regardless of意为“不考虑，不顾及”。