Final answer:
Faber designed the electronic radio transmitter for secret communication with others in Ray Bradbury's dystopian novel, making option B the correct answer.
Step-by-step explanation:
The student's question about why Faber designed the electronic radio transmitter refers to a scenario from Ray Bradbury's novel Fahrenheit 451. In the context of the book, Faber designed the electronic radio transmitter for secret communication. It's a device that allows him to speak discretely with Montag to avoid detection in their oppressive society. While Faber may have had a passion for technology and innovation, the primary purpose of creating the device was to communicate secretly, making option B the correct answer.