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Which of the following pairs regarding the effect of alloying elements in steel are correctly matched?             

1.   Molybdenum: Forms abrasion resisting particles

2.   Phosphorous: Improves merchability in free cutting steels

3.   Cobalt: Contributes to red hardness by hardening ferrite

4.   Silicon Reduces oxidation resistance

Which of these statements are correct?

(a) 2,3 and 4                   (b) 1,3 and 4

(c) 1,2 and 3                   (d) 1,2 and 4

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