Use proper punctuation in the blank space of the following sentence :
I have no money _________ therefore I cannot afford a servant.

The correct answer is Option C (; (semicolon)).

Key Points:
• Core Language Concept Tested: The question primarily tests the candidate's understanding of Punctuation marks in English grammar, specifically focusing on how to link two independent clauses using conjunctive adverbs.
• Why the Correct Option is Right: The official answer key marks option 3 as correct. This is absolutely accurate. "I have no money" and "I cannot afford a servant" are both independent clauses capable of standing alone as complete sentences. When joining two independent clauses with a conjunctive adverb like 'therefore', 'however', or 'moreover', strict English punctuation rules require a semicolon before the conjunctive adverb (and usually a comma after it, though the focus here is the preceding mark).
• Common Exam Traps and Pitfalls: A common mistake candidates make here is selecting the comma. Using just a comma to separate two independent clauses creates a grammatical error known as a "comma splice".
• Elimination of Incorrect Options: A colon is used to introduce lists, explanations, or quotes, which doesn't fit here. A hyphen is used to join words into compounds. Thus, by a process of systematic elimination based on strict punctuation rules, we arrive safely at the semicolon.
• Preparation Strategy: For future exams, thoroughly revise the specific punctuation rules regarding comma splices, semicolons, and independent clauses.
• Key Takeaway: Remember: Always use a semicolon before a conjunctive adverb (like therefore, however) that connects two independent clauses.