The correct answer is C. Younger persons have lower mortality on account of lower age.
Mortality is the probability of death in a given population. It is usually expressed as a percentage or a rate per 1,000 people. Mortality rates are higher for older people than for younger people. This is because older people are more likely to have chronic diseases and other health problems that can lead to death.
Insurance companies use mortality rates to calculate the premiums they charge for life insurance. They charge higher premiums to people who are more likely to die, and lower premiums to people who are less likely to die. This is why young people are charged lower premiums than older people for life insurance.
The other options are incorrect. Option A is incorrect because young people may have more income than older people. Option B is incorrect because older people may not be able to afford to pay more for their insurance. Option D is incorrect because younger people have lower mortality, not higher mortality.