Solve the Problem $f$ Is Increasing or Decreasing $f$ Is Decreasing for the Given

Multiple Choice

Solve the problem.
-The following data set gives the average home value, in dollars, for a city at 5 -year intervals.


Determine where $f$ is increasing or decreasing.

A) $f$ is decreasing for the given $x$ values.
B) $f$ is increasing for the given $x$ -values.
C) $f$ is constant for the given $x$ -values.
D) $f$ is increasing until 1980, then $f$ is decreasing for remainder of $x$ -values.