Linear interpolation is used to …

A. approximate a value outside of the range of known data values by determining a line
which best fits the entire data set.
B. approximate a value outside of the range of known data values by extending the line
which connects the last two known data points.
C. approximate a value inside of the range of known data values by determining a line
which best fits the entire data set.
D. approximate a value inside of the range of know data values by connecting adjacent
points in the data set with a line.

D. approximate a value inside of the range of know data values by connecting adjacent
points in the data set with a line.