The y value of point C that makes the figure a parallelogram is
2.) 0
How to find the y value
In a parallelogram, the opposite sides are equal.
Side AD is 4 units apart, hence side BC should be 4 units apart.
To get side BC we look for the point that will make BC 4 units
The side will be in relation to side D, this makes 2.) 0 the best choice