The correct answer is **If** (Option 3). **Comprehensive Derivation:** The correct answer is - "If" Explanation & Key Takeaways: • From the given options, the most appropriate answer is "If". • If uses to introduce a possible or imaginable situation to be happen. • Eg. If he comes, I will visit him. • Here 1st sentence is a condition to be happen and 2nd is a consequence of 1st. • Thus, Option 3 is correct option. • Let us see the usages of the other options - • But - uses to introduce something which does not include in the main sentence. • Eg. I will go but not stay there. • In spite of - uses to express contrasting statements. • Eg. In spite of the pain in his leg, he completed the marathon. • Though - uses to introduce something happening despite something. • Eg. Though he work hard, he failed. **Option Elimination:** • **Option 1 (But)**: Incorrect distractor. • **Option 2 (In spite of)**: Incorrect distractor. • **Option 3 (If)**: Correct Answer; accurate according to canonical reference. • **Option 4 (Though)**: Incorrect distractor. **Exam Trap:** Be careful of misleading distractors and subtle terminology differences. Verify core properties before selecting your answer. **Memory Booster:** Core mnemonic rule: If corresponds to Option (3).