The Nuclear Non-Proliferation Treaty, which bans the spread of nuclear weaponry, is an example of what type of arms control?

In a single-group, posttest-only study, an observed difference

A) cannot be a placebo effect. B) might be a placebo effect. C) is strong evidence for a causal relationship. D) is almost always going to be statistically significant.

When Germany first failed to pay the war reparations established by the Versailles Treaty, France sent troops to reoccupy Berlin until payment was received

Indicate whether this statement is true or false