With Respect to the Ordinary Least-Squares Technique of Estimating an Equation

With respect to the ordinary least-squares technique of estimating an equation,
"best fitting" means that the estimated equation line will:

A) be as straight as possible.
B) pass through the minimum number of the observed data points as possible.
C) be as close as possible to the observed data points.
D) maximize the sum of the distances between the estimated line and observed data points.