Which verbal operant requires the child to identify and respond to features of objects?

The verbal operant that involves a child identifying and responding to features of objects is the listener response of class feature (LRFFC). This operant is essential in developing a child's ability to categorize and describe objects based on their characteristics, such as size, color, shape, or other distinguishing attributes.

When a child engages in a listener response of class feature, they are typically responding to prompts related to the features of objects. For instance, if asked to identify what is "red" among a selection of items, the child demonstrates understanding by recognizing and pointing out the relevant object. This skill not only promotes language development but also cognitive skills such as classification and comparison.

In contrast, tacts involve labeling or naming objects or actions, echoics are about repeating what someone else says, and mands are requests made to fulfill a desire or need. Each of these other verbal operants serves different purposes in communication but does not specifically focus on the identification and response to the features of objects as LRFFC does.