Given the lines:
JK and LM
Let's determine the relationship of both lines.
We can see the given angle is 90 degrees.
This means both lines JK and LM meet at right angles,
Since both lines meet at right angles, the lines are perpendicular to each other.
Perpendicular lines are defined as lines that meet each other at right angles (90 degrees).
Therefore, lines JK and LM are perpendicular lines.
ANSWER:
C. Perpendicular