To ward of Tybalt... Romeo practically could already tell that someone or many people were going to die on the street between the two houses
The underlined word is a complete subject. So, the best option is A.
<span>Truman set up Loyalty Review Board to investigate over 3 million.
Congress set up HUAC to look for Communists.
Hollywood created list of 500 people and refused to hire people on black list.</span>
The difference I see is exhibit(n) are items or objects and exhibition is an event in which the items are shown