Two lines on the graph are cut by a transversal. Which angles must be congruent for the lines to be parallel?
A) ∠1 and ∠4
B) ∠1 and ∠8
C) ∠2 and ∠4
D) ∠2 and ∠8
E) ∠5 and ∠6
B) 1 and 8 (alternate exterior angles)
+1982 
