It came as a great to the parents that their son finally came back safe and sound.
A. favor
B. sense
C. relaxation
D. relief
网友回答
A. favor
B. sense
C. relaxation
(答案→)D. relief
解析：A. favor恩惠，帮助，B. sense 感觉，C. relaxation放松，D. relief 宽慰，缓解，根据句意：儿子安然无恙的回来对父母是个安慰。所以选D。