题目内容：
Thomas Alva Edison was awarded more patents(专利) on inventions than any other American. When he died in 1931, Americans wondered how they could best show their respect for him. Onesuggestion was that the nation observe a minute or two of total black-out. All electric power would beshut off in homes, streets and factories.
Perhaps this suggestion made Americans realize futly what Edison and his inventions meant tothem. Electric power was too important to the country. Shutting it off for even a short time would haveled to complete confusion. A black-out was out of the question.
On the day of Edison's funeral, many people silently dimmed their lights. In this way theyhonored the man who had done more than anyone else to put the great force of electricity at hiscountrymen's fingertips.
根据以上内容,回答题.
（ ） People decided to honor Edison when __________ . A．he made the first electric light
B．electric power was 100 years old
C．the country realized electricity's importance
D．he died in 1931
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