The correct answer is D.
The y-component of the vector, is the same as the vertical component of the vector.
We can see from the graph that each box in the grid is one unit.
The component of vector a is
We count 4 boxes along the positive y- axis to get the y-component of vector a.
See graph in attachment.
the length of the vector c is 1 along Y direction
As the graphical representation is given in this figure we can say the two components of the vectors are
height of the vector = Y components
horizontal distance = x component
so here we can say
So the length of the vector c is 1 along Y direction
Vector has y component value 3