"The very idea of retirement is a relatively new invention. For most of human history, people worked until they died or were too infirm to lift a finger (at which point they died pretty fast anyway). It was the German statesman Otto von Bismarck who first floated the concept, in 1883, when he proposed that his unemployed countrymen over the age of 65 be given a pension. This move was designed to fend off Marxist agitation—and to do so on the cheap, since few Germans survived to that ripe old age."

A、In the past people always worked till they were disabled.
B、 The idea of retirement is a new one.
C、Why it was the german who invented the idea of retirement.
D、The idea of retirement was a good invention.