A. The size of an I-frame depends on the preceding P-frame: In the H.264 video compression, the size of an I-frame (Intra-coded frame) can be affected by the preceding P-frame (Predictive frame) because the I-frame can use information from the previous P-frame for compression. B. Increased motion in a scene means increased bit rate: H.264 is a video compression standard that adjusts the bit rate based on the complexity of the scene. Higher motion scenes generally require more data to encode the movement accurately, thus leading to an increased bit rate.