Answer:
i dont think that russia is responsable for WWI but germany is, it had the resources to end it by withdrawing its blank cheque which offered suport to austria for its invasion to serbia. russian leaders knew that it would have been in a much stronger position to fight in two years, after having completed its rearmament plan.
A preamble is an introductory statement aimed to summarize the ideals and goals of the speech, letter, declaration, etc.
Good luck!
C, as the others dont deal with the selling of securities