The 'transition temperature' for ductile to brittle behaviour of steel increases with increase in the __________ content in steel. (A) Carbon
(B) Manganese
(C) Both 'a' nor 'b'
(D) Neither 'a' nor 'b'
(B) Manganese
(C) Both 'a' nor 'b'
(D) Neither 'a' nor 'b'