What was the contribution of the scientist $M. W. Beijerinck$ in $1898$ regarding the study of viruses?

  • A
    He discovered the first virus.
  • B
    He demonstrated that the extract of the infected plants of tobacco could cause infection in healthy plants and called the fluid as Contagium vivum fluidum.
  • C
    He showed that viruses could be crystallized.
  • D
    He discovered that viruses contain $RNA$.

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