this equation relates temperature measured in degrees celsius, c, to degrees fahrenheit, f. is there is a proportional relationship between c and f? how do you know? select all true statements.(3 points) yes. there is a proportional relationship between c and f because the point (0,0) is on the graph. yes. there is a proportional relationship between c and f because when the value of c is zero, f is zero as well.. no. there is not a proportional relationship between c and f because the point (0,0) is not on the graph. no. there is not a proportional relationship between c and f because when the value of c is zero, f is not zero.