The rest of the options are:
A. k,m
B. k,s
C. q,s
Two pairs of lines are perpendicular when the form to each other an angle of 90 degrees or a right angle.
In this case:
A. The lines k and m appear to form a right angle. They appear to be perpendicular.
B. The lines k and s are not forming a right angle.
C. D. The lines q and s appear to be perpendicular. They appear to form a right angle.
E. The lines p and m do not seem to form a right angle, so they are not perpendicular.
F. The lines q and k do not seem to form a right angle. They are not perpendicular.
Then, the correct answers are A, C, D.