Solomon Places a Large Amount of Cash in the Hand

Solomon places a large amount of cash in the hand of a street person. What would make this an act of altruism?

A) The street person is blind and cannot thank Solomon for his act.
B) The street person hands Solomon a bag of cans that he is carrying.
C) Solomon feels pity for the person as he gives him the cash.
D) Solomon has a habit of engaging in these types of activities.