Two parallel lines AB and CD are intersected by a transversal EF at M and N respectively. The lines MP and NP are the bisectors of interior angles ∠BMN and ∠DNM on the same side of the transversal. Then ∠MPN is equal to :

Two parallel lines AB and CD are intersected by a transversal EF at M

1.	Two parallel lines AB and CD are intersected by a transversal EF at M and N respectively. The lines MP and NP are the bisectors of interior angles ∠BMN and ∠DNM on the same side of the transversal. Then ∠MPN is equal to :
A.	45°
B.	60°
C.	90°
D.	120°
Answer» D. 120°