Aresearcher is making an argument that the increase in nuclear weapons led to distrust between american and soviet citizens in the 1980s. which of the following is a primary source that will her argument?

(a)a speech by president reagan about the cold war
(b)a table of military statistics on new nuclear weapons by year
(c)an academic article about economic policy in the soviet union
(d)a newspaper editorial about american-soviet pen-pal programs