What Was the Breaking Point of Détente Under Willy Brandt

What was the breaking point of détente under Willy Brandt?

A) His repression of immigration from across the eastern border
B) His involvement in a series of espionage scandals that made the west look inattentive to Soviet spy campaigns
C) The economic downturn of the 1970s
D) The west German population objected to the military installments of foreign nations in their country
E) The assassination of Israeli Olympic athletes in Munich gave the impression of lack of vigilance