A lady G3P1A1 is admitted to the labour room at term.Cervix is 4cm dilated,Membrane are intact and head is palpable 3/5 per abdomen.After 4 hours, repeated examination is done and cervix is 5 cm dilated, station in unchanged and the cervicograph remains on the right side of alert lens.Which of the following statements about the progress of labor is true.

• A. The cervicograph progress is satisfactory
• B. The head was engaged at the time of presentation
• C. The cervicograph on repeat examination would touch the action line.
• D. The cervicograph status suggests that intervention is likely to be required.