Four words are given below, out of which only one word is spelt correctly in standard English. This question tests your ability to recognise correct spelling. Choose the correctly spelt word.

Introduction:
Spelling questions check your familiarity with common English words as they are correctly written. In competitive exams, spellings are chosen so that they sound similar but only one is acceptable in standard written English. Here you must pick the correct spelling of the noun that means resistance or open disobedience to authority, which is "defiance".

Given Data / Assumptions:
- You are given four visually similar spellings: Defianse, Defyance, Difiance, and Defiance.
- Only one of these matches the standard dictionary spelling of the word meaning resistance or bold disobedience.
- We assume you are familiar with common English spelling patterns such as the suffix "-ance".

Concept / Approach:
The word in question is "defiance". It comes from the verb "defy", but when forming the noun, the spelling changes and we use the suffix "-ance" rather than directly inserting a "y". Many English nouns of this type end with "-ance" or "-ence", and a good vocabulary book will highlight such patterns. The method is to recall the correct spelling if you know it, or to eliminate obviously incorrect patterns that violate common spelling rules.

Step-by-Step Solution:
Step 1: Think of the correct word in a sentence, for example, "The protestors showed defiance in front of the authorities."Step 2: Visualise the spelling you normally see in books and articles, which is "defiance".Step 3: Compare each option. "Defianse" ends with "anse", which is not the usual "-ance" ending.Step 4: "Defyance" inserts a "y" between "f" and "a", which does not match the standard noun form.Step 5: "Difiance" has the vowels in the wrong place, starting with "Di" instead of "De". Only "Defiance" follows the correct pattern.

Verification / Alternative check:
You can verify by consulting a dictionary or spelling list, where the only recognised spelling will be "defiance". Another mental check is to recall related words: the adjective "defiant" and the verb "defy". While "defy" contains a "y", the noun removes the "y" and adds "-ance" in the usual way. This reinforces that option D is the valid spelling.

Why Other Options Are Wrong:
Option A, "Defianse", is incorrect because the final letters "anse" do not match the common English suffix "-ance". Option B, "Defyance", wrongly mixes the verb form "defy" with the noun suffix, creating a non standard spelling. Option C, "Difiance", starts with "Di" and changes the first vowel, making it a different and incorrect word form. None of these appear in standard dictionaries. Only option D, "Defiance", is correct.

Common Pitfalls:
Many candidates get confused because they see the root "defy" and then try to preserve the "y" in the noun form. This is a common error when building words from a base verb. To avoid such mistakes, it is helpful to learn families of words together, like "defy, defiant, defiance". Additionally, paying attention to typical endings such as "-ance", "-ence", "-tion", and "-sion" will make spelling questions much easier in exams.

Final Answer:
The correctly spelt word in the list is Defiance.