Q: Viruses were assumed to exist before they were first seen with an electron microscope in which decade?


Read this paragraph and choose the correct option from the provided answers:

Viruses were assumed to exist before they were first seen with an electron microscope in the 1930s. Multiple hypotheses for viral origins have been proposed.

 Choices:

- 1960's

- 1890's

- 1940's

- 1930 ' s


A:
1930 ' s