In "Famine, Affluence, and Morality," Peter Singer argues that we have a moral obligation to help those in need, particularly when the cost to ourselves is minimal compared to the benefit to others. In the case of seeing a child drowning in a shallow pond, Singer would assert:
A. I have a moral obligation to save the child even if it gets my clothes muddy.
Singer's argument emphasizes that the moral imperative to help others, particularly in life-and-death situations, outweighs the trivial costs we might incur, such as dirty clothes.