Engine: General Subjects

1. A will move to the right, and "C" will move to the left, but lagging behind "B"
2. B will move to the left, and "C" will move to the right, but will lag behind the movement of "A"
3. C will move to the right, as will "C"
4. D will move to the left, as will "C"

Tip: press A-D to answer