In English spelling and vocabulary, four alternative words are given. Choose the correctly spelt word from the options below.

Introduction / Context:
This question checks your knowledge of correct English spelling. In many competitive exams, candidates are asked to identify the correctly spelt word among several confusing variants. Here the test focuses on a set of words where only one spelling is standard and accepted in good English usage, while the others contain common errors.

Given Data / Assumptions:
The options provided are:

• Debilitate
• Impecable
• Inkulcate
• Harrass

Concept / Approach:
To answer such questions, you need familiarity with standard spellings from reading and practice. When you see a word that seems unfamiliar, break it into familiar roots and prefixes, or recall similar words that you have seen in books or reliable sources. In English, small variations like double consonants, missing letters, or incorrect vowel patterns often indicate incorrect spelling. The word debilitate is a common verb meaning to weaken. The other three options resemble real words but are incorrectly formed.

Step-by-Step Solution:
Step 1: Check Debilitate. This is a known English verb that means to make someone or something weak. The standard spelling is d e b i l i t a t e. Step 2: Examine Impecable. It appears to be a misspelling of impeccable, which should have a double c and a double p: impeccable, not impecable. Step 3: Examine Inkulcate. This seems to imitate the word inculcate, which means to instil ideas or values. The correct spelling starts with i n c, not i n k, so inkulcate is incorrect. Step 4: Examine Harrass. This looks like a wrong form of harass. The correct spelling has a single r and double s: harass, not harrass. Step 5: Since Debilitate matches the accepted dictionary spelling and the other options do not, Debilitate is the correctly spelt word.

Verification / Alternative check:
You can confirm by consulting a reliable dictionary or remembering how these words appear in standard texts. Debilitate is commonly used in sentences such as The disease can debilitate the patient. The other forms, impecable, inkulcate, and harrass, would be underlined as incorrect in any spell checker or grammar tool. Therefore, the decision is firmly supported by reference to standard English.

Why Other Options Are Wrong:
Impecable is wrong because the correct word is impeccable with double c and double p. Inkulcate is wrong because the standard word is inculcate, beginning with inc, not ink. Harrass is wrong because the accepted spelling is harass, with one r followed by double s. Each of these incorrect options reflects a very common misspelling that exam setters use to test attention to detail.

Common Pitfalls:
Students often rely only on how a word sounds and therefore insert or remove consonants incorrectly. Another pitfall is assuming that double letters can appear anywhere without pattern. Regular reading of books, newspapers, and formal writing helps fix the correct visual shape of words in memory. When in doubt, think of related forms such as debilitating or debility for debilitate, which can reinforce the correct arrangement of letters.

Final Answer:
The correctly spelt word is Debilitate.