In which sentence from the passage does the writer use an idiom? “but my grandmother's transaction made it clear: online shopping has become as commonplace as brushing your teeth.” (paragraph 2) “not that my grandmother is a dinosaur, mind you.” (paragraph 1) “buying a car, a major appliance, or fine jewelry online raises a lot of red flags for me.” (paragraph 7) “and last but not least, who would buy something without seeing it first? ” (paragraph 2)