What does Singer believe those who live in relatively affluent countries have a duty to sacrifice to protect people in poor countries from preventable evils? Question 65 options: A) as much as they can afford without sacrificing something of comparable moral worth to what the poor are lacking B) as much as they can afford without radically altering their lifestyles C) as much as it would take to eradicate the evils if everyone else in that economic situation gave an equal amount D) one-tenth of their incomes