c. the forced door to the birdcage
Mrs. Wright asked Mrs. Peters and Mrs. Hales to go to the farmhouse and collect a few things for her. The trifles began with Mrs. Wrights kitchen described (by the two) as messy and hastily deserted.
The writer of "The Instinct that Makes People Rich" interprets the Midas myth as the story of a man who could not fail.
Chesterton, however, says that Midas DID fail. He starved because he could not eat gold.
Chesterton says that success always comes at the sacrifice of something else, something "domestic." (By this he means that, yes, a millionaire has money but will lack something else, like love or friendship, etc.) He says that people who think Midas succeeded are just like the author of the article -- both worship money.
Chesterton says that worshipping money has nothing to do with success and everything to do with snobbery.
I think that the correct option is C: the role of the idiom in this sentence is to explain that bad habits are creating a bad financial situation.
An idiom may be defined as a figure of speech established by usage that has a meaning not necessarily deductible from those of the individual words. Idioms are not always meant to be taken literally.
In this case, the idiom is explaining the cause of financial situation.
I think it might be answer A.