The figure shown has two parallel lines cut by a transversal:

A pair of parallel lines is shown, crossed by a transversal. Angles are identified as 1, 2, 3, 4, 5, 6, 7, and 8. Angles 1-4 are on the top line clockwise from upper left. Angles 5-8 are on the lower line clockwise from upper left.
Use the figure to complete the sentence. (4 points)

∠3 and ____ are alternate interior angles.

a
∠2

b
∠6

c
∠5

d
∠8