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FluffBall
I'm not sure. But i think the answer is C
You can see that none of the lines are about to/ are intersecting 
JeanaShupp

Answer: Lines r and s and lines t and u must be parallel.

Step-by-step explanation:

If [tex]\angle{8}\cong\angle{10}[/tex] which are alternate interior angle corresponding to line t and u.

then by Alternate interior angle property :

Lines t and u must be parallel.

If [tex]\angle{1}\cong\angle{7}[/tex] which are alternate exterior angle corresponding to line r and us.

then by Alternate exterior angle property :

Lines r and s must be parallel.

Hence, Lines r and s and lines t and u must be parallel.

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