The correct answer is **perception ... behaviour** (Option 3). **Comprehensive Derivation:** The correct answer is "perception ... behaviour" Explanation & Key Takeaways: • The noun "perception" refers to the way in which someone experiences and understands the world around them, while "behavior" refers to the way in which someone acts or behaves. The sentence is describing how drugs can alter these aspects of a person's life, so "perception" and "behavior" are the most appropriate nouns to fill in the blanks. • Other options are incorrect because they do not fit the context of the sentence as well as "perception" and "behavior": • "pathways" and "boredom" are not related to the idea of drugs altering someone's experiences and actions, as expressed in the sentence. • "vision" and "perception" are somewhat similar in meaning, but the idea of drugs altering someone's vision is not the same as the idea of drugs altering their perception more broadly. • "thinking" and "childhood" are not relevant to the idea of drugs altering someone's experiences and actions, as expressed in the sentence. • Thus, as per the above explanation the correct answer is Option 3. Correct sentence: Drugs not only alter perception but also memory, mood, and behaviour. **Option Elimination:** • **Option 1 (pathways ... boredom)**: Incorrect distractor. • **Option 2 (vision ... perception)**: Incorrect distractor. • **Option 3 (perception ... behaviour)**: Correct Answer; accurate according to canonical reference. • **Option 4 (thinking ... childhood)**: 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: perception ... behaviour corresponds to Option (3).