Which of the following statements is true about Karel's movements?

Karel's capabilities are defined by a set of commands that allow it to control its movements within the grid environment. The ability to move and turn based on defined commands is fundamental to programming Karel effectively. This means Karel can execute specific instructions to move forward, turn left, or perform other actions, which enables a user to design sequences of actions that accomplish tasks within its environment.

The statement highlights that Karel's movements are not limited or arbitrary but are rather determined by the commands the programmer provides. This flexibility allows Karel to navigate the space, interact with objects, and respond to the grid layout according to the instructions given in the program. By using commands like 'move()', 'turnLeft()', and so on, programmers can guide Karel through various challenges, making it a powerful tool for learning programming concepts.

In contrast to other statements, Karel is not constrained to turning only or moving solely forward, nor does it possess any sort of autonomous navigation ability. Each action Karel takes must be explicitly programmed, reinforcing the importance of understanding command definitions in programming contexts.