the complete question is
Which phrase best describes the graph of a proportional relationship?
A.a straight line passing through the origin
B.a straight line
C.a curve
D.not a straight line
we know that
A relationship between two variables, x, and y, represent a proportional relationship (direct variation) if it can be expressed in the form
[tex] \frac{y}{x}=k\\ or\\ y=kx [/tex]
the equation [tex] y=kx [/tex] is a straight line passing through the origin with slope equal to k
therefore
the answer is the option
A.a straight line passing through the origin
