Imagine That You Walk by a Pond in Which a Three-Year-Old

Imagine that you walk by a pond in which a three-year-old girl is about to drown. You are the only person around and unless you rescue the girl she will die. A world in which all children in distress are left to die by passers-by is conceivable. However, you cannot rationally will that all of us were to live in such a world. You, therefore,

A) have a strong utilitarian reason to rescue the girls if you can do so without danger to yourself.
B) have an imperfect Kantian duty to rescue the drowning girl.
C) act virtuously if you rescue the girl, because this is the generous and courageous thing to do.
D) All of the above