Ineed on number 8 it's really hard to me anyone i'm jut asking

Read the following sentence from excerpt of the narrative of the live of frederick douglass and define the bolded word: "why master was so careful of her, may be safely let to conjecture." question 10 options: a) prayer or hope b) guesswork or speculation c) relief or ease d) disapproval or disappointment

For all of those, i want the answer. me.

What is the main idea of this paragraph from the volcanoes section of the ready. gov website