Although soviet leader mikhail gorbachev's policy of "perestroika" was intended to restructure the economy it to bring about the end of the cold war because

the answer is option a.

the triple alliance. germany and austria-hungary were already allies by 1879 when, worried about a threat from russia, they formed the dual alliance. italy joined the group in 1882. there was a concern about a possible attack from france and the alliance needed powerful friends to defend it.