After the collapse of russian resistance in the winter of 1917–1918, the german general staff select one: a. decided on a defensive strategy of attrition to wear the allies down. b. began secret negotiations with the allies regarding an armistice. c. occupied moscow and pushed troops deep into siberia. d. launched a powerful offensive in france in the spring of 1918. e. planned an assault on the americas with seizures of bases in the caribbean.