Final answer:
Gordie is having difficulty with inhibitory control and planning, as he races around instead of waiting his turn to walk down the aisle, showing issues with suppressing inappropriate actions and planning.
Step-by-step explanation:
The student's question is related to the concept of executive functions, which are cognitive processes that allow us to regulate our behavior, make decisions, and achieve goals. Four-year-old Gordie's difficulty in remaining still despite being instructed to wait for his turn to walk down the aisle at his uncle's wedding suggests issues with inhibitory control and planning.
Inhibitory control is the ability to suppress actions that are inappropriate in a given context and to resist temptations, while planning involves thinking ahead and preparing for future actions. Given the options, the main answer in 200 words is that Gordie is struggling with planning and inhibitory control as he is unable to stop himself from racing around and does not plan how to wait for his turn effectively.