In arguing that we have an obligation to charity, Peter Singer is treating as similar which of the following pairs? Having a child with a disability and refraining from having a child until later so that they do not have a disability; Bombing $30$ enemies knowing that you$$d also kill $2$ civilians and bombing $2$ civilians in order to get $30$ enemies to surrender; Coming across a drowning child but failing to save him because it$$d ruin your shoes and failing to donate and save a child$$s life to instead buy expensive shoes instead; Robbing a charity and failing to donate to that charity.