GAUSS7 2008 Problem 19

A 4\times4 square grid can be entirely covered by three non-overlapping pieces made from 1\times1 squares. If the first two pieces are gauss 7 2008 19q and gauss 7 2008 19q2, the third piece is

Answer Choices
A. gauss 7 2008 19a
B. gauss 7 2008 19b
C. gauss 7 2008 19c
D. gauss 7 2008 19d
E. gauss 2008 19e