Q: Which of the following sentences is nonsensical?
Options:
- Sentence A: "Staring at an electronic screen for long periods of time is good for a teenager's eyesight"
- Sentence B: "Staring at an electronic screen for long periods of time is bad for a teenager's eyesight"

Let's solve this gradually.
Staring at an electronic screen for periods of time can damage a teenager's eyesight. The answer is Sentence A.