What work ends with the phrase, "workers of all countries, unite! "?
the communist manifesto
the wealth of nations
the condition of the working class in england
the declaration of the rights of man and the citizen

but it is sometime nessary to hit key points or subjects   but is sometimes to much reveiw if there was a way to slim down the redone work it would improve for every body.

assuming the underlined word is "regnant", the correct answer is b) ruling.