50. According to the passage, which of the following statements is true?
(A) Businesses should wait until more scientific evidence is released before taking safety precautions.
(B) Twenty-seven operators in the U.S. have won the lawsuit against the employers who require them to use VDTs.
(C) In most European countries, workers are not allowed to spend more than four hours a day on a VDT.
(D) Concrete evidence shows that VDTs are the main cause of women’s miscarriages.