单项选择题

What does "this" refer to in the expression "this appears less of a hazard"

A．Some foreign power.
B．The design of the security systems.
C．A terrorist attack.
D．Sabotage by people working for an enemy country.
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How did Renault test drive the Racoon
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B．In actual reality.
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Why would a terrorist go to the Atomic Energy commission's public reading room
A．To find out how to design a bomb.
B．To find out where to steal plutonium.
C．To look at files of secret information.
D．To find out where to steal an atomic bomb.
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