If Year 1 Cost of Goods Sold Equals $700, Year

If Year 1 cost of goods sold equals $700, Year 2 cost of goods sold equals $840, and Year 3 cost of goods sold equals $630, the percentage to be assigned for Year 1 in a trend analysis, assuming that Year 1 is the base year, is

A) 100%.
B) 90%.
C) 111%.
D) 120%.