Which of the Following Factors Contribute(s) to a Successful Labor

Multiple Choice

Which of the following factors contribute(s) to a successful labor?
I. The client's pelvis is of adequate size and contour.
II. The fetus is in an advantageous position and presentation and is of appropriate size.
III. The uterine contractions are adequate.
IV. The client has a strong sense of self-esteem.

A) I and II
B) I and III
C) I, II and III
D) Successful labor depends of all of the above factors.