The question asks to identify the common feature in the relationship given between the colors Green, Violet, and Orange. Let's examine each option and determine the most suitable one based on the provided reasoning:
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They are primary colours:
- The primary colors (in an RGB model) are Red, Green, and Blue. In a pigment model (CMY), they are Cyan, Magenta, and Yellow. Notice that Green is a primary color here, but neither Violet nor Orange fit in either primary category.
- Conclusion: This option is incorrect.
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These colours occur together in a rainbow:
- A rainbow occurs due to the dispersion of light, and the visible spectrum of a rainbow includes the colors Red, Orange, Yellow, Green, Blue, Indigo, and Violet.
- Since Green, Violet, and Orange are all present in a rainbow, they do indeed occur together in this phenomenon.
- Conclusion: This option is correct.
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They are made by mixing other colours:
- Orange is made by mixing Red and Yellow. Violet is made by mixing Blue and Red. Green is a primary color (in additive color theory).
- This means only two out of these three colors are mixed from other colors.
- Conclusion: This option is partially true but does not fully justify the relationship, thus incorrect.
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These colours are not found in butterflies:
- Butterflies display a wide range of colors, including Green, Violet, and Orange depending on the species and patterns.
- Color presence can vary widely among butterfly species, thus disqualifying this statement as a universally applicable feature.
- Conclusion: This option is incorrect.
By analyzing the options, the second choice, "These colours occur together in a rainbow," is the correct answer as it universally and accurately applies to Green, Violet, and Orange.