Each member of a group of 100 students was asked whether they play the piano and whether they play the violin. 70 students said that they play the piano and 35 said that they play the violin.
Which one of the following statements cannot be deduced from the information given?

A At least 5 students play both the piano and violin.
B At least twice as many students play only the piano as play only the violin.
C At most 35 students play both the piano and the violin.
D Every student plays at least one of the piano and the violin.​