What is Mr. Estrada accused for

A．follows
B．predicts
C．defies
D．violates

A．For six months of the year there is total darkness in Antarctic.
B．Even in the summer months the temperature is often below zero in Antarctic.
C．The expedition led by Ronald Amundsen was the largest and best equipped expedition that had ever set out for the Antarctic.
D．Byrd’s major achievement was to introduce the use of aircraft, radio and other devices in polar exploration.