The correct answer is **I have known him** (Option 4). **Comprehensive Derivation:** The correct answer is "I have known him" Explanation & Key Takeaways: • The error in the sentence lies in the phrase "I am knowing him." • "I have known him" is the correct usage. • "Have known" is a form of present perfect tense, which is used to indicate a link between the present and past. • This fits the context as the sentence involves a time period that continues from the past (2014) to the present. • So, the correct sentence would be "I have known him since 2014." Therefore, the correct answer is "Option 4". **Option Elimination:** • **Option 1 (I was knowing)**: Incorrect distractor. • **Option 2 (I had known)**: Incorrect distractor. • **Option 3 (I knows)**: Incorrect distractor. • **Option 4 (I have known him)**: Correct Answer; accurate according to canonical reference. **Exam Trap:** Be careful of misleading distractors and subtle terminology differences. Verify core properties before selecting your answer. **Memory Booster:** Core mnemonic rule: I have known him corresponds to Option (4).