How Does Singer Understand the Phrase "Without Sacrificing Anything of Comparable

Multiple Choice

How does Singer understand the phrase "without sacrificing anything of comparable moral significance"?

A) Singer thinks it means one should always promote what is good and not merely prevent what is bad, because promoting good is the opposite side of the coin to preventing bad.
B) Singer thinks it means one should never sacrifice one's own interests to help someone else because one's own interests are more important than the interests of others.
C) Singer thinks it means one should never do something wrong in itself because evils are always incomparable.
D) Singer thinks it means one should not cause anything comparably bad from happening, do something wrong in itself, or fail to promote a good comparable in significance to the bad one can prevent.