Which of the Following Can We Infer from Singer's Argument

Multiple Choice

Which of the following can we infer from Singer's argument that we should prevent something bad from happening if it is within our power to do so and we need not sacrifice anything of comparable moral importance?

A) Any time someone buys a product that is not a basic need, one is failing to adhere to Singer's principle because there are others in the world who do not have their basic needs met.
B) One must spend sixty percent of one's energy and time calculating what is of comparable moral significance to preventing famine relief.
C) One should do everything in one's power to fight against the devastation of climate change, which may threaten humanity's entire existence.
D) One should always prevent harm from happening to oneself because there is nothing of greater moral importance to oneself.