**Explanation:**

Grasshoppers have various adaptations that help them protect themselves from being eaten by their predators. One of the effective ways a grasshopper protects itself is by camouflaging itself in the grass.

**Camouflage in the Grass:**
- Grasshoppers have evolved to have body colors that blend in with their surroundings, particularly the grass they inhabit.
- Their bodies are usually green or brown, allowing them to camouflage effectively in the grass and vegetation.
- When a grasshopper remains still in the grass, it becomes difficult for predators to spot them due to their similarity in color and texture with the surroundings.
- This adaptation helps grasshoppers avoid being detected by their predators, such as birds, reptiles, and other insect-eating animals.

**Advantages of Camouflage:**
- Camouflage enables grasshoppers to remain hidden from predators, increasing their chances of survival.
- It provides them with a means of defense without having to rely solely on speed or physical traits.
- By blending into the grass, grasshoppers can effectively avoid being detected, giving them more time to find shelter or escape if necessary.
- This adaptation also allows grasshoppers to ambush their prey, as they can remain hidden until the right moment to strike.

**Other Adaptations:**
While camouflage is a significant adaptation for grasshoppers, it is not the only defense mechanism they possess. Grasshoppers also have other adaptations that help protect them:
- Their ability to hop away quickly (option B) allows them to escape from predators that may have spotted them despite their camouflage.
- Some grasshopper species have glands that produce distasteful or toxic substances, making them unappealing or harmful to predators (option A).
- However, the correct answer to the given question is option C because camouflage is the primary defense mechanism used by grasshoppers to protect themselves from being eaten by their predators.

In conclusion, grasshoppers have evolved the ability to camouflage themselves in the grass, which helps them avoid being eaten by predators. This adaptation is crucial for their survival and increases their chances of escaping detection and predation.

They protect themselves from predators by camouflage; when detected, many species attempt to startle the predator with a brilliantly coloured wing flash while jumping and (if adult) launching themselves into the air, usually flying for only a short distance.