Rainbow colour order — arrange only the listed colours in their natural sequence (outer to inner in a primary rainbow). Given colours: Red, Green, Violet, Yellow, Orange. Choose the correct left-to-right order from outer (Red side) toward inner (Violet side).

Introduction / Context:
Rainbows display sunlight dispersed by water droplets into colours that appear in a fixed order. In a primary rainbow, the outer rim appears reddish and the inner rim appears violet. This question restricts the set to five colours (Red, Orange, Yellow, Green, Violet) and asks for their correct order from outer to inner, matching the natural sequence a viewer observes in the sky.

Given Data / Assumptions:

• Primary rainbow (not secondary).
• Colours available: Red, Orange, Yellow, Green, Violet.
• Order required: outer to inner.

Concept / Approach:
The standard primary rainbow order from outer to inner is Red, Orange, Yellow, Green, Blue, Indigo, Violet. Restricting to the five listed colours simply removes Blue and Indigo while preserving the relative order of the remaining colours.

Step-by-Step Solution:
Start with the canonical sequence: R O Y G B I V.Remove B and I (not present in the options set).Remaining order is: Red, Orange, Yellow, Green, Violet.

Verification / Alternative check:
Photographs and physics references consistently show red on the outer edge and violet on the inner edge for a primary rainbow, confirming ROYGV as correct for the given subset.

Why Other Options Are Wrong:
They either reverse the ends (putting violet outside), scramble the middle trio, or misplace green relative to yellow.

Common Pitfalls:
Confusing primary and secondary rainbows (which invert the order), or forgetting that red is outermost in the primary arc.

Final Answer:
Red, Orange, Yellow, Green, Violet