Which of the following research projects uses mental chronometry as its primary method $?$ Testing if people mentally rotate objects at a constant speed to decide whether two objects are rotated or mirrored versions of the same object by measuring their response times. Measuring how long it takes people to decide whether to turn left or right at intersections at different distances from their final destination to test whether they make those decisions by planning how to get to their destination. Measuring how accurate people are at deciding if two images show rotated versions of the same object. Determining how many mental operations of which kind people perform when sorting numbers by analyzing their response times as a function of the list they were asked to sort.