The Table Below Shows the Sales for a Plastics Manufacturer

The table below shows the sales for a plastics manufacturer recorded over the past year. The
Seasonal indexes for each quarter are also provided. To track the trend for these four quarters, use
The indexes to deseasonalize the sales data.
Overall, based on these four quarters, sales:

A) are definitely increasing.
B) are definitely decreasing.
C) are constant.
D) are exponentially decreasing.
E) cannot be determined.