Final answer:
The authors do not develop the idea that boredom is beneficial by (d) quoting an expert. They discuss the creative benefits of boredom, the feelings associated with it, and the effects of never experiencing boredom, but do not cite expert quotes.
Step-by-step explanation:
The authors develop the idea that boredom is good for us in several ways, but they do not specifically address the option (d) quoting an expert as a method of developing this idea. Instead, they explore boredom's benefits by (a) explaining how boredom can fuel creativity and imagination, which ties into the concept that in historical contexts, people were more hands-on in creating and shaping things. Also, there's mention of (b) describing how unpleasant boredom feels, touching on the drive for arousal and the discomfort of underarousal or overarousal; and (c) explaining what happens to our brains if we are never bored, suggesting that dissatisfaction and lack of creativity can influence our sense of enjoyment and well-being.
The information provided does not mention that they developed the idea by quoting any experts; therefore, option (d) quoting an expert is the correct answer as to how the authors did not develop the idea that boredom is good for us.