Which of the following pairs regarding the effect of alloying elements in steel are correctly matched? 1. Molybdenum: Forms abrasion resisting particles. 2. Phosphorus: Improves machinability in free cutting steels. 3. Cobalt: Contributes to red hardness by hardening ferrite. 4. Silicon: Reduces oxidation resistance. Select the correct answer using the codes given below:

Which of the following pairs regardin

1.	Which of the following pairs regarding the effect of alloying elements in steel are correctly matched? 1. Molybdenum: Forms abrasion resisting particles. 2. Phosphorus: Improves machinability in free cutting steels. 3. Cobalt: Contributes to red hardness by hardening ferrite. 4. Silicon: Reduces oxidation resistance. Select the correct answer using the codes given below:
A.	2, 3 and 4
B.	1, 3 and 4
C.	1, 2 and 4
D.	1, 2 and 3
Answer» B. 1, 3 and 4

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