Which choice best revises the sentence so that it offers text evidence from heart of a samurai

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

Which option is the most relevant piece of evidence for this claim

The empire state building was constructed by one hundred workers