What is the most precise correction if blue-violet text is unclear on dark violet?

Correct answer: Make the text value lighter

The governing concept is readability through value contrast. Blue-violet text placed on dark violet has insufficient light-dark separation, even though the hues are not identical. Lightening the text increases its value contrast against the dark background and makes the letter shapes easier to read. Darkening the text or matching the values reduces separation, while adding more violet may make the background even less distinct. Thus option A is the precise correction.