Read this excerpt from Joseph Stalin's radio broadcast on July 3, 1941:
Non-aggression pacts are pacts of peace between two
States. It was such a pact that Germany proposed to us in
1939. Could the Soviet Government have declined such a
proposal? I think that not a single peace loving State could
decline a peace treaty with a neighboring State even
though the latter was headed by such fiends and cannibals
as Hitler and Ribbentrop.
What do the underlined words in this excerpt most clearly suggest?
O
A. Germany's attack on Russia had been planned to be brutal.
O
B. Germany's attack on Russia had been planned for a long time.
C. Germany's attack on Russia was similar to betraying all the rules
of civilization.
O
D. Germany's attack on Russia was similar to one tribe making war
on another

I think that not a single peace loving State could decline a peace treaty with a neighboring State even though the latter was headed by such fiends and cannibals as Hitler and Ribbentrop.
Non-aggression pacts are pacts of peace between two States. It was such a pact that Germany proposed to us in 1939.

The first one is irony of the highest order. Though Stalin was correct in his assessment of Hitler and Ribbentrop, he didn't include himself (who may have been the worst of the three), in his description.

The second one is just a definition of what a non-aggression pact was.

I would pick B. The real problem is what is underlined. B is the truth. It was actually Hitler's plan to invade Russia long before it happened. Not only that, he was so confident of victory that he did not order his textile industry to make protective clothing when he did invade Russia. He thought it would be over in Russia long before such clothing was needed.