Suppose That Last Month the Cost of Inputs Summed to $100,000

Suppose that last month the cost of inputs summed to $100,000, and the value of outputs summed to $800,000. For which of the following values this month would productivity increase?

A) inputs = $110,000, outputs = $800,000
B) inputs = $50,000, outputs = $400,000
C) inputs = $200,000, outputs = $1,600,000
D) inputs = $100,000, outputs = $820,000
E) inputs = $300,000, outputs = $1,600,000