I would actually say B, because nook and cranny means " a place or part of a place, especially small or remote"
Answer:
Thinking about what you want to learn
Explanation:
Looking for an easy way out is obviously not a good response
highlighting is doing way too much work
thinking about other things while reading won't help you focus
The last one is an example of irony
The answer is b, because it has dark words rather the other up beat ones
Simile, because a simile needs like or as in the sentence