For which pair of lines are ∠1 and ∠2 alternate interior angles if d is the transversal?

1. a and b

2. b and c

3. c and d

4. d and a

For which pair of lines are 1 and 2 alternate interior angles if d is the transversal 1 a and b 2 b and c 3 c and d 4 d and a class=