In many languages other than English there is a word for "mother's brother" which is different from the word for "father's brother," whereas English uses the word "uncle" for both. Thus, speakers of these languages evidence a more finely discriminated kinship system than English speakers do. The number of basic words for be perceptually unable to distinguish as many colors as speakers of English can distinguish.
What this question is testing
Argument
The author says: languages have different numbers of basic color words, and that means speakers of language with fewer color words literally can't see as many colors as English speakers can.
Evaluate
That's a big jump — from words to perception. The author is treating vocabulary as a direct readout of what the brain can perceive. For that leap to work, we'd need a rule: each language has a different word for every sensory quality its speakers can tell apart.
Think of it like this. If you assume then someone with fewer taste words really would have fewer taste perceptions. It's a strong claim about how language and the senses connect.
Goal
An answer that gives us the missing rule — each basic word corresponds to one perceivable quality, and vice versa.
Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.