i need help make sure it's right plz

Metro by T-Mobile ~ 5:13 PM 128% a course.apexlearning.com Question 37 of 40 Erica is given the diagram below and asked to prove that AB II DF . What would be the missing step of the proof? Given: Point B is the midpoint of EF, and point A is the midpoint of ED. Prove: AB II DF E(X2. )2) A B ( x , , 1 1 ) D F (X3, )1) Statements Reasons 1. Point B is the midpoint of EF and Given Point A is the midpoint of ED. 2. Midpoint of DE = Kitx2 Vity2 Definition of a midpoint and the Midpoint of 2 3. the slope of AB (v2 + y,)-(Vit y2) =0 and the slope (x2+*3)- (x,+x2)_ of DF 1- V1 =0 4. slope AB = slope DF Substitution Property of Equality 5. ABIDF Definition of parallel lines O A. slope EA = slope AB O B. slope AB = slope OF C. slope ED = slope EF D. slope DE = slope OF SUBMIT