The smallest cell structure that would most likely be visible with a standard (not super-resolution) research-grade light microscope is a ) mitochondrion
b) microtubule
c) ribosome
d) microfilament

A

Explanation:

This is a double membrane organelle of   0.5- 1 to 1 micrometer in diameter; and 7 micrometre in length.

Since the resolution of light ,microscope is less than 200nm; only the mitochondrion  can be seen with this microscope.

The mitochondrial functions a s the power house of the cell. for generation of ATPs

Howevrer the parts of other options are closer  than 200nm in diameter and are ; therefore are not visible to this microscope.

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