Which sentence from "lifeboat ethics" by garrett hardin best demonstrates the art of using logos?

a. but does everyone on earth have equal right to an equal share of its resources?
the spaceship metaphor can be dangerous when used by misguided idealists to
justify suicidal policies for sharing our resources through uncontrolled
immigration and foreign aid. in their enthusiastic but unrealistic generosity, they
confuse the ethics of a spaceship with those of a lifeboat.

b. this is the basic metaphor within which we must work out our solutions. lets us
now en rich the image, step by step, with substantive pressing problems of
overpopulation and hunger.

c. while this last solution clearly offers the only means of our survival, it is morally
abhorrent to many people. some say they feel guilty about their good luck.
my reply is simple: "get out and yield your place to others."

d. as of 1973, the u. s had a population of 210 million people, who were increasing
increasing by 0.8 percent per year. outside our lifeboat, let us imagine another
210 million people (say the combined populations of colombia, ecuador,
venezuela, morocco, pakistan, thailand and the philippines) who are increasing
at a rate of 3.3 percent per year.