Based on the Notion of Kin Selection, You Could Most

Based on the notion of kin selection, you could most easily explain which of the following helping scenarios?

A) Sarah, vacationing in another state, rescues a child from a burning building.
B) Paul dives into the freezing ocean to save a stranger.
C) Marc pays for an expensive medical treatment for his son.
D) Doug assists his neighbour in building a new shed.