Which of the following is an indicator of agitation in a child with respiratory distress?

In the context of respiratory distress in a child, increased movement and restlessness serve as significant indicators of agitation. When a child is experiencing difficulty breathing, their body may reflexively respond with signs of distress, which can manifest as restlessness or constant shifting. This behavior stems from an innate response to ensure adequate airflow and comfort; the child may feel uncomfortable and is trying to find a position that relieves the sensation of breathlessness.

In contrast, options that suggest calmness or laughter would be contrary to what one would typically observe in a child who is struggling to breathe. Laughter, for instance, can be seen as an expression of joy or comfort, while sitting calmly does not reflect the distress associated with respiratory issues. Increased vocalizations could indicate some level of discomfort but are not as direct an indicator of agitation as increased movement. Therefore, increased movement and restlessness effectively signal a child's agitation in the face of respiratory distress, making it the correct answer.