The thickness of oxide film is y at time t. If K1, K2 and K3 are the temperature dependent constants, the parabolic law of oxidation is given by __________________?

A. y = k1 t + k2

B. y = k1 ln (k2t + k3)

C. y2 = 2k1t + k2

D. y = k1t3 + k2

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