What Strategies Are Used to Delay Premature Birth

What strategies are used to delay premature birth
I.Bedrest
II.Antibiotics
III.Terbutaline
IV.ToColytics
V.Insertion of suture around cervix to prevent from opening
VI.CortiCosteroid therapy
VII.Breathing techniques

A) I, II, III, and V
B) I, II, IV, and VII
C) I, II, IV, and VI
D) I, IV, V, and VI