In the 1920s, Riga was where Kremlin watchers like Loy Henderson and George F. Kennan cut their teeth. Other members of this group, which drove U.S. foreign policy towards the Soviet Union in the pre-war period, were James Forrestal, the Dulles brothers, and William Bullitt._______________________
This question is taken from an editorial. Option (b),(c),(d) actually follow option (a) in the editorial, which in turn is the last sentence of the paragraph. Option (a) is the correct answer