Which of the following is considered a desirable reaction to a child's behavior?

Complementing desirable behavior is considered a desirable reaction because positive reinforcement encourages children to repeat that specific behavior. When adults acknowledge and praise appropriate actions, children become more aware of what they are doing right, which promotes self-esteem and motivation. This method fosters a supportive environment where positive actions are encouraged, making it more likely that the child will continue to engage in such behavior in the future.

In contrast, spanking can lead to increased aggression and does not teach children appropriate ways to behave. Ignoring the child may not provide any guidance or teaching, leaving them unsure of the consequences of their actions. Scolding loudly can instill fear rather than instill understanding, and it might damage the child's confidence or relationship with the caregiver. Therefore, complementing desirable behavior stands out as the most effective and constructive approach among the options presented.