Which of the following was a component of the Non-aggression Pact Hitler signed with Soviet leader Joseph Stalin in 1939?
A. The two countries agreed to attack each other, either independently or in conjunction with other powers
B. Support any third power that might attack the other party to the pact
C. Not to remain in consultation with each other upon questions touching their common interests
D. Not to join any group of powers directly or indirectly threatening one of the two parties