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What is the range of grain size for coarse grained igneous rock?

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What is the range of grain size for coarse grained igneous rock?

(a) Above 2 mm

(b) Below 2 mm

(c) Above 5 mm

(d) Below 5 mm

This question was posed to me in an internship interview.

The question is from Composition and Texture of Igneous Rocks topic in section The Study of Rocks of Engineering Geology

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Correct option is (c) Above 5 mm

To explain I would say: When the average grain size is above 5 mm; the constituent minerals are then easily identified with naked eye. These rocks are termed as coarse-grained rock.

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