Task: Question Answering
Input (English): Question: In each series, look for the degree and direction of change between the numbers. In other words, do the numbers increase or decrease, and by how much
Look at this series: 80, 10, 70, 15, 60, ... What number should come next?

 Option A: 30

 Option B: 40

 Option C: 20

 Option D: 50

 Option E: 60
Output (English): Option C