What must you jump over in Race 4?

In Race 4, the requirement to jump over a stream highlights the unique challenges presented in various racing scenarios. Streams can present slippery and unstable edges that require careful timing and technique when jumping. Successfully navigating this obstacle can demonstrate a competitor's agility and balance, which are crucial qualities in races that involve navigating natural terrains. Additionally, overcoming a stream may involve understanding the dynamics of water flow and the best angles for a safe and efficient jump.

The other options each present different physical challenges but do not pertain to the specific requirements of Race 4, which centers around the unique attributes of jumping over a stream. Fences, walls, and pits, while common obstacles in various contexts, do not match the specific criteria established for this race scenario.