Which of the following is most indicative of postpartum subinvolution?

Choice A rationaleUterine atony refers to a lack of muscle tone in the uterus, leading to postpartum hemorrhage, not subinvolution.Choice B rationaleProlonged lochia discharge indicates incomplete uterine involution, as the uterus has not returned to its pre-pregnancy size.Choice C rationaleSevere cramping may be related to other postpartum complications and is not specific to subinvolution.Choice D rationaleHigh fever is more indicative of an infection rather than subinvolution of the uterus.