问题

There is no greater love than ________ who devotes his whole life ________ mankind.
A:that of a man; to benefiting
B:a man; to benefiting
C:that of a man’s; benefits
D:a man’s love; in benefiting;
B:a man; to benefiting
C:that of a man’s; benefits
D:a man’s love; in benefiting;
正确答案是: