Straitford is most proud of its ______.

A．Straitford's prediction about Ukraine has proved true
B．Straitford guarantees the truthfulness of its information
C．Straitford's business is characterized by unpredictability
D．Straitford is able to provide fairly reliable information

A．causing the biggest trouble
B．exerting the greatest effort
C．achieving the greatest success
D．enjoying the widest popularity