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C is corrent.  Inability to determine beginning supplies inventory would cause supplies expense to be understated and year 2 net income to be overstated. Cumulative supplies expense would be properly stated so there would be no effect on December 31, year 2 retained earnings.   
A is incorrect.    Inability to determine beginning supplies inventory would cause supplies expense to be understated and year 2 net income to be overstated. Cumulative supplies expense would be properly stated so there would be no effect on December 31, year 2 retained earnings.   
B is incorrect.   Inability to determine beginning supplies inventory would cause supplies expense to be understated and year 2 net income to be overstated. Cumulative supplies expense would be properly stated so there would be no effect on December 31, year 2 retained earnings.  
D is incorrect.  Inability to determine beginning supplies inventory would cause supplies expense to be understated and year 2 net income to be overstated. Cumulative supplies expense would be properly stated so there would be no effect on December 31, year 2 retained earnings.