The term "vision loss" is prominent among some advocacy groups. Rather than saying a person is blind or even visually impaired, they now tend to refer to a "person with vision loss." Whether this constitutes a euphemism is, I suppose, a matter for debate.
Answer:
C. An adolescent boy loses his apprentice job as a carpenter because he chooses to go swimming instead of working.
Extinction is a natural process but with the expansion of the human race it is occurring at a excelling rate.