Let's analyze the question: **Match the heat treatment process with its description:** **Options:** - A. Annealing - B. Hardening - C. Snap Temper - D. Cryogenic Treatment **Descriptions:** 1. Complete removal of stresses 2. Prevent cracking 3 Resistance to impact 4. Eliminate residual stresses --- ### Step-by-step solution: - **A. Annealing**: Usually involves heating and slow cooling to remove stresses and soften the metal. - Corresponds to description **1** (Complete removal of stresses). - **B. Hardening**: Rapid cooling of metal to increase hardness and strength. - Corresponds to description **3** (Resistance to impact). - **C. Snap Temper**: A process to improve toughness after hardening, often involves quick tempering. - Corresponds to description **2** (Prevent cracking). - **D. Cryogenic Treatment**: Deep cooling process to eliminate residual stresses and improve properties. - Corresponds to description **4** (Eliminate residual stresses). --- ### Matching: - A. Annealing → 1 - B. Hardening → 3 - C. Snap Temper → 2 - D. Cryogenic Treatment → 4 ### Correct option: **A.1, B.3, C.2, D.4** **Therefore, the correct answer is:** **Option 1: A.1, B.3, C.2, D.4**