A Graph Measures Y on the Vertical Axis and X

Multiple Choice

A graph measures y on the vertical axis and x on the horizontal. The curve on the graph is a horizontal line. From this fact we know that

A) the value of x never changes.
B) the value of y does not depend on the value of x.
C) the ratio of x to y is constant.
D) the slope of the line is not defined because y never changes.