Hey Student!
Thank you for the wonderful question.
To guide your thinking, you should NOT add your own interpretation (your subjective opinion) to the text. Instead, you want to stay as close to the information given in the passage. For (D), there are no words/phrases that indicate, demostrate, or imply humor, so you definitely want to stay away from these types of answers (unless the passage supports them, of course).
Tip: for rhetorical strategy questions, think about what that part in the passage is "doing." Is it describing a past experience? Is it giving an example? Is it making a comparison? Etc... Thinking about rhetorical strategy questions in this way will help you stay away from answers that are too subjective (interpretative). Save the interpretation for your English literature classes =). The SAT can never be a subjective test; it is 100% objective, meaning that the correct answer will always be supported in the reading passage in some way.
By the way, what can I call you? =) Do you have an English name? You can call me Jin Teacher or SSAM =)
Talk to you soon!
Keep Moving Forward!
You Got This!