The activity that causes changes in the behavior of costs is referred to as the activity .

"Index" is the right answer.

Explanation:

This same activity index gives a visual representation that results in improvement throughout the financial parameters. Indexes that seek to give or present a comprehensive overview including its economic situation.It, therefore, makes it possible for administrators to decide on appropriate feedback expenses.

Thus the above is the correct answer.

The federal reserve took an expansionary approach during the crisis. this was done by expanding the money supply and boosting liquidity. this can be seen in the fed's actions of lending to banks, purchasing securities, and lowering the federal funds rate in order to lower overall interest rates. the fed's goal was to increase consumer spending and overall liquidity within the system, and they pursued this by expanding the supply of liquid money.