As we know the equation of a straight line is \\\\(Y=mX+C\\\\)Let us assume \\\\(X\\\\) and \\\\(Y\\\\) are two different physical quantity and C is any constant. and the graph between them is straight line. According to above equation, \\\\(Y\\propto X\\\\)Hence, \\\\(X\\\\) and \\\\(Y\\\\) are Directly proportional.Option C