Given that lines a and b are parallel, what angles formed on line a when cut by the transversal are congruent with ∠7?
A∠1 and ∠2
B∠1 and ∠3
C∠2 and ∠3
D∠2 and ∠4
A∠1 and ∠2
B∠1 and ∠3
C∠2 and ∠3
D∠2 and ∠4