To determine which two figures correctly show the sense of relative movement across transform faults, we should review the concept of transform faults and tectonic plate movement.

Transform Faults:

• Transform faults occur where two tectonic plates slide past one another horizontally.
• The movement along these faults is typically horizontal, with plates moving in opposite directions.

Let's analyze each figure:

1. Figure A: The arrows indicate movement away from each other on the opposite sides of the fault. This implies extensional movement, not typical for transform faults.
2. Figure B: The arrows indicate leftward movement on the top side and rightward movement on the bottom side, which is characteristic of a left-lateral transform fault.
3. Figure C: The arrows on opposite sides exhibit a similar pattern, with movement towards each other in a horizontal manner, which also illustrates left-lateral transform fault movement.
4. Figure D: The arrows suggest compressional forces, which is not typical of transform faults, as they do not usually involve significant compressional or extensional stresses.

Conclusion: Figures B and C correctly illustrate the sense of relative movement typical for transform faults, where the motion is dominantly horizontal and lateral.

Hence, the correct answer is B and C.