Final answer:
After decreased motor activity, newborns typically display increased crying and restlessness as a way to communicate their needs, stemming from instinctive survival reflexes.
Step-by-step explanation:
After a decrease in motor activity, newborns commonly exhibit increased crying and restlessness (Option A). This response is part of the natural reflexes and survival mechanisms present from birth. Newborns use crying as a form of communication to express various needs, such as hunger, discomfort, or the desire for closeness. Sensory abilities and reflexes, such as the rooting and sucking reflexes, are instinctive behaviors designed to aid in the baby's survival. As the newborn matures, periods of sleep will also follow periods of decreased motor activity, but the typical immediate reaction to reduced motor activity is increased crying and restlessness rather than immediate sleep, heightened alertness, or increased feeding.