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ANSWER:   B.  (a+b, c) 

Since the plane is a parallelogram, if c is the y-value of Point P, then c is also the y-value of Point Q, the corresponding vertex parallel to x-axis.

If the x-value of Point P is a units to the right of y-axis, then add a units to the x-value of its opposite vertex Point R which is b, to find the x-value of Point Q.

Point Q    y = c
                x = a + b

Coordinates of Point Q = (a + b, c)