Which of the following is an example of stereotyped motor movements?

Stereotyped motor movements refer to repetitive body movements that are often observed in individuals with autism. These movements can include actions such as hand flapping, rocking, or, in this case, the specific example of lining up toys or flipping objects. This behavior is characterized by its repetitive nature and the lack of functional purpose, often serving as a self-soothing mechanism or a way to express excitement or anxiety.

In contrast, the other options illustrate behaviors that are more variable and interactive. Improvising a new game and engaging in dramatic play involve creativity and social interaction, which are not typically associated with stereotyped movements. Varying speech patterns during a conversation indicates a flexible use of language that adjusts according to the social context, which contrasts with the repetitive characteristics of stereotyped motor movements. Therefore, the choice of lining up toys or flipping objects clearly exemplifies stereotyped motor movements due to its repetitive and often non-functional nature.