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Which of the following metals results in the ignition in extreme cases?

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Which of the following metals results in the ignition in extreme cases?

(a) Sodium

(b) Magnesium

(c) Niobium

(d) Sodium, magnesium, and niobium

The question was posed to me in an interview.

This question is from High Temperature Materials in portion High Temperature Corrosion of Corrosion Engineering

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The correct answer is (d) Sodium, magnesium, and niobium

Easy explanation: If the rate of heat transfer from metal to surroundings is less than heat evolution from oxide formation then it increases the surface temperature of metals. This leads to the ignition of metals and it includes sodium, magnesium, and niobium.

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