Step 1: Understanding the Concept:
The question asks to identify the word that is spelled incorrectly from the given list of options.
Step 2: Detailed Explanation:
Let's check the spelling of each word:
- (A) Campaign: This is spelled correctly. It refers to a series of planned activities to achieve a particular aim.
- (B) Controversy: This is spelled correctly. It means public disagreement or heated discussion.
- (C) Secretry: This is spelled incorrectly. The correct spelling is Secretary.
- (D) Decision: This is spelled correctly. It means a conclusion or resolution reached after consideration.
Step 3: Final Answer:
The word 'Secretry' is mis-spelt. The correct spelling is 'Secretary'. Therefore, option (C) is the answer.