In these three-letter groups, the last two letters βATβ remain constant while only the first letter changes. The first letters form the sequence R, S, T, U, which are consecutive in the alphabet. The next letter after U is V. Hence VAT is the term that continues the pattern of increasing the first letter by one while keeping βATβ fixed.
Option A:
Option A is correct because it respects both parts of the pattern simultaneously. It uses V as the next letter after U and retains the common ending βATβ without modification. This makes VAT a natural and unique extension of the given series.
Option B:
Option B, WAT, would be the next term if the series continued beyond VAT, but it skips the immediate successor required here. It jumps directly to W as the first letter, ignoring V, and therefore does not represent the very next element in the sequence. This violation of immediate succession makes WAT incorrect.
Option C:
Option C, RAA, changes both the first and last two letters, breaking the stable suffix βATβ that all terms share. It also does not follow the alphabetical order of the first letters. Since it fails to preserve the key structural feature of the series, RAA is not acceptable.
Option D:
Option D, RAT, repeats the very first term of the sequence without any forward progression. The pattern is clearly based on moving the first letter forward, not on cycling back prematurely. Therefore RAT cannot serve as the next term in this context.
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