Answer:
Straight line.
Step-by-step explanation:
On a graph a straight line shows a direct proportion relation.
The graph equation for a straight line is
y = mx + c
Where
m = slope
c= y-intercept
So here if we change "x" y will change linearly with the change.
B) a jagged line: it is a random relation between two properties
C) downward curved line: It is inverse relation with some log factor or square or other root.
D) upwardly curved line: it is direct relation with some log factor or square or other root.