Answer:
Option 3 - (8,4)
Explanation:
Given : Three consecutive vertices of a parallelogram are points (2, 4), (0, 0), and (6, 0).
To find : The fourth vertex is point ?
Solution :
We have given that points are forming a parallelogram.
Let the fourth coordinate is (x,y)
Now, we draw a rough image of the given situation.
Refer the attached figure below.
Draw a parallelogram ABCD with mid point O.
Applying the mid point between two points (2,4) and (6,0).

Now, Applying mid point between points (0,0) and (x,y)



Therefore, The fourth vertex point is (8,4).
Hence, Option 3 is correct.