Correct option is C
Characteristics of Contour line:
Closely spaced contours indicate a steep slope.
Closed contour lines with higher values inside show a hill.
Two contour lines having the same elevations cannot unite and continue as one line. Similarly, a single contour cannot be split into two lines
The steepest slope of terrain at any point on a contour is represented along the normal of the contour at that point. They are perpendicular to ridge and valley lines where they cross such lines.
Contours of different elevations cannot cross each other (caves and overhanging cliffs are the exceptions).
Contours of different elevations cannot unite to form one contour (a vertical cliff is an exception).