How Does Singer Respond to the Objection That People Have

How does Singer respond to the objection that people have a right to spend the money they earn on themselves?

A) He says that having a right to do something doesn't settle the question on what you should do.
B) He says that knowing you should do something entails that you have a right to do it.
C) He denies that people have a right to spend the money they earn on themselves.
D) He argues that people also have a right to spend the money they earn on others.