1. The problem asks to identify which labeled angles on the triangular prisms are right angles. 2. A right angle is an angle of exactly 90 degrees. 3. On the left triangular prism, angles j, k, and l are labeled. 4. On the right triangular prism, angles q and r are labeled. 5. Typically, in a triangular prism, the right angles are those where the base meets the height or the side faces meet the base at 90 degrees. 6. Without a diagram, we rely on the color coding and typical labeling conventions: blue angles (j, k, l) and green angles (q, r). 7. Usually, right angles are marked distinctly, often with a small square symbol or indicated by color. 8. Since the problem states to select all right angles, and given the colors, the right angles are likely the blue angles j, k, and l on the left prism. 9. The green angles q and r on the right prism are less likely to be right angles based on typical conventions. 10. Therefore, the right angles are j, k, and l. Final answer: The right angles are $j$, $k$, and $l$.