An Iron ore mine in Brazil cost $4M and contains an estimated amount of 1,600,000 tons of Iron ore. In the first year, 300,000 tones of iron ore were extracted from the mine; in the second year, 200,000 tones of iron ore were extracted from the mine; and in the third year, 500,000 tons of iron ore were extracted from the mine. What is the depletion expense in the second year? O a. Cannot determine without the useful life of the Iron ore mine O b. $500,000 O c. $750,000 Od $1,600,000 e. $1,250,000