Solve the Problem $f$ Is Increasing or Decreasing $\mathrm { f }$

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