Directions: The question that follows has a conclusion followed by two statements A and B.

Mark (1): if statement A alone is adequate to arrive at the conclusion Mark (2): if statement B alone is adequate to arrive at the conclusion Mark (3): if both statements A and B are required to arrive at the conclusion Mark (4): if both statements are insufficient to draw the conclusion Mark (5): if either A alone or B alone is adequate

The Shoemaker-Levy collision with Jupiter was an unprecedented event in the universe. A. Never before the Shoemaker-Levy collision has the earth been witness to a comet's collision with a planet. B. Never before in the history of Universe have so many projectiles repeatedly struck a planet.