It would be "<span>Making a contact" that is not one of the most common uses of Twitter, since Twitter is used mostly to interact with people you already know, or who you "follow". </span>
I would say <span>d.none of the above
All of those were attempts to </span><span>remove imperial control over other nations.</span>
It is A. John F. Kennedy ordered a blockade on Cuba to prevent any other missiles. The Soviet Union saw this as an act of war.