From the given alternative words, select the single word which cannot be formed using the letters of the word COMFORTABLE.

Introduction / Context:
This question checks letter manipulation skills. The learner must decide which option word cannot be formed from the letters in the base word COMFORTABLE. Such tasks involve both recognising available letters and counting how many times each letter appears. They help build accuracy and attention in verbal reasoning exercises.

Given Data / Assumptions:

Base word: COMFORTABLE. Letters in COMFORTABLE: C, O, M, F, O, R, T, A, B, L, E. Options: FORT, TABLE, COMFORT, ROUTE, BLOAT. Letters may be used at most as many times as they appear in the base word.

Concept / Approach:
The approach is to perform letter frequency analysis. For each option, we check every letter against the supply from the base word. If an option uses a letter that is not present at all, or needs a letter more times than supplied, that option cannot be formed. All other options are considered formable and therefore not the required answer. The question aims to identify exactly one impossible word among plausible looking choices.

Step-by-Step Solution:
Step 1: Count letters in COMFORTABLE: C(1), O(2), M(1), F(1), R(1), T(1), A(1), B(1), L(1), E(1). Step 2: Check FORT. Required letters: F, O, R, T. Frequencies needed: F(1), O(1), R(1), T(1). All are available, so FORT can be formed. Step 3: Check TABLE. Required letters: T, A, B, L, E. Each of these appears once in COMFORTABLE, so TABLE can be formed. Step 4: Check COMFORT. Required letters: C, O, M, F, O, R, T. COMFORTABLE has exactly these letters with at least those counts, so COMFORT is clearly formable. Step 5: Check ROUTE. Required letters: R, O, U, T, E. The base word has R, O, T, and E, but there is no U in COMFORTABLE. Therefore ROUTE cannot be formed. Step 6: Check BLOAT. Required letters: B, L, O, A, T. All these letters are present at least once in COMFORTABLE, so BLOAT is also formable.

Verification / Alternative check:
A faster verification method is to scan for new letters not present in COMFORTABLE. The options FORT, TABLE, COMFORT, and BLOAT all use letters drawn entirely from C, O, M, F, O, R, T, A, B, L, and E. However, ROUTE introduces U, which does not appear in the base word. This immediately marks ROUTE as the only impossible word to construct from COMFORTABLE, confirming the detailed analysis.

Why Other Options Are Wrong:
FORT is wrong as the answer because all its letters occur within COMFORTABLE with sufficient frequency. TABLE is wrong because T, A, B, L, and E all appear exactly once and are available in the base word. COMFORT is wrong as it obviously comes from the first part of COMFORTABLE and is fully supported by the letter set. BLOAT is wrong because B, L, O, A, T are each present and can clearly form a meaningful word.

Common Pitfalls:
Students may overlook one missing letter and focus only on overall familiarity of words. It is also common to miscount letters when done mentally, especially if the base word is long. Another pitfall is to assume that a less common or more complex looking word like COMFORT or TABLE must be impossible, when in fact it is formed directly from the base word. Writing down letter counts and scanning carefully for new letters like U in ROUTE helps avoid such mistakes.

Final Answer:
The word that cannot be formed from COMFORTABLE is ROUTE.