What does indicate in the following partograph indicators?

Ans. B. Moderate uterine contractionsThe partograph is a graphical presentation of the progress of labor, and of fetal and maternal condition during labor.It is the best tool to help you detect whether labor is progressing normally or abnormally, and to warn you as soon as possible if there are signs of fetal distress or if the mother's vital signs deviate from the normal range. Research studies have shown that maternal and fetal complications due to prolonged labor were less common when the progress of labor was monitored by the birth attendant using a partograph.Different shadings on the squares drawn on partograph indicate the strength & duration of uterine contractions: