Hich sentence from the passage best illustrates hardin's central argument?
a. and since the world's resources are dwindling, the difference in
prosperity between the rich and the poor can only increase.
b. put differently, the doubling time for this aggregate population is
21 years, compared to 87 years for the u. s.
c. the harsh ethics of the lifeboat become even harsher when we
consider the reproductive differences between the rich nations
and the poor nations.
d. 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.

Read the rough-draft paragraph. exercising daily is one of the best ways to the body fight fatigue, illness, stress, and weight gain. whether taking a bike ride, enjoying a walk, or going for a swim, the type of activity is not as important as exercising consistently. often, people begin the new year with the resolution of exercising, but within a few months that commitment is quickly forgotten. the key is to choose something that is accessible, enjoyable, and affordable. exercising just thirty minutes a day not only strengthens the heart and lungs, but it also to boost one’s energy. another way to feel more energized is to eat a balanced diet. since no single food item can supply the body with everything it needs, it is important to eat a variety of foods. so to maintain a long, happy life, get out there and get moving, and enjoy a wide range of healthy meals. which statement best describes the mistake the writer makes in this paragraph?