The thickness of oxide film is y at time t . If K 1 , K 2 and K 3 are the temperature dependent constants, the parabolic law of oxidation is given by

• A. y 2 = 2 k 1 t + k 2
• B. y = k 1 ln ( k 2 t + k 3 )
• C. y = k 1 t + k 2
• D. y = k 1 t 3 + k 2