How did the railroads contribute to the end of the large buffalo herds?

Which of these statements best describes the ambiguity in this excerpt

Kublai khan honored his mongol heritage by: a)marring only one wife b)praying facing mecca five times a day c)slaughtering ten chinese officials every year d)building a large enclosed hunting ground at shangdu,his summer palace

What does the document of the birtish octopus is an uderlying cause of the world war 1