Final answer:
The statement congruent with distributed practice is that learning levels are higher over time when sessions are distributed, due to better memory consolidation.
Step-by-step explanation:
The statement that is congruent with the notion of distributed practice is: d. distributed training sessions tend to result in higher learning levels over time. Distributed practice refers to spreading out study sessions over time rather than concentrating them in a single session, also known as cramming. This approach allows for better consolidation of memories, which enhances long-term retention of the material. This concept is based on the understanding that our brain needs time to process and solidify new information, hence, learning is more effective when spread out over intervals.