<span>D. Kennedy wishes to signal other nations that the Soviet Union poses a serious threat to global safety.
Kennedy wanted to make it clear that other countries, such as the Soviet Union, could pose a real threat to the whole world if their technology began to surpass that of the United States.</span>
The verb is "should work"
Should is an auxiliary verb, and "work" is an action verb.
True because is you started your research on a topic, you are stuck to it because you are learning more facts about that topic. hope this helps!