Which of the following statements regarding labor in the pregnant patient is TRUE?
(A) False labor or Braxton Hicks contractions are characterized by irregular, brief contractions that lead to changes in the cervix.
(B) True labor is characterized by painful, repetitive uterine contractions that increase steadily and lead to changes in the cervix.
(C) Cervical dilatation of the cervix refers to the process of thinning that occurs during labor.
(D) Effacement describes the diameter of the internal cervical os and is used as an indicator of the progression of labor.