Which of the Following BEST Describes How to Time Contractions

Multiple Choice

Which of the following BEST describes how to time contractions?

A) Time from the start to finish of a single contraction.
B) Time from the beginning of one contraction to the beginning of the next contraction.
C) Time from when the contraction ends to when the next one begins.
D) Time throughout labor - from the first sign of tightening to the birth of the baby.