The virologist .... Showed that the viruses could be crystallized .

Options

A. W.M . Stanley
B. T. O. Diener
C. M.W. Beijerinek
D. D.J . Ivanowsky

Answer

To solve the question regarding which virologist showed that viruses could be crystallized, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Key Concept**: The question asks about the virologist who demonstrated that viruses could be crystallized. This is a significant milestone in virology.

2. **Recall Historical Context**: The study of viruses began in the late 19th century. One of the earliest significant findings was the crystallization of viruses, which helped in understanding their structure and composition.

3. **Identify the Scientist**: The scientist known for showing that viruses could be crystallized is W. M. Stanley. He was awarded the Nobel Prize in Chemistry in 1946 for his work on the crystallization of the tobacco mosaic virus.

4. **Eliminate Incorrect Options**: The other scientists mentioned (T. O. Dynier, M. W. Bezirnik, and D. J. Levinaski) contributed to virology but were not responsible for the crystallization of viruses. For example, T. O. Dynier discovered viroids, which are smaller infectious agents than viruses.

5. **Final Answer**: Based on the information gathered, the correct answer to the question is W. M. Stanley.

### Final Answer:
**W. M. Stanley**

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