Which of the Following Best Captures Singer's Response to the Objection

Which of the following best captures Singer's response to the objection that rather than giving to famine relief, one should work to establish effective population controls because that will solve the root problem behind starvation?

A) Singer argues that climate change and the natural disasters it causes is the main problem behind famine and not the lack of effective population control.
B) Singer argues that one should contribute resources to famine relief and to organizations that work to effectively limit the human population.
C) Singer argues that this does not give one reason to do nothing, but if population control is the best means of preventing famine in the long run, then it is consistent with his position for one to try to bring about effective population controls.
D) Singer proposes that more research be done to determine the best means of contributing to famine relief before anyone takes action that may be counterproductive.