All high-risk foods contain enough Water to support bacterial growth. Water is a critical component for microbial life, as bacteria require moisture to grow and multiply.
- Time does contribute to bacterial growth but is not a direct component of the food.
- Salt can inhibit bacterial growth by drawing out moisture, so it is not a component that promotes it.
- Air can be important for certain types of bacteria but is not the primary factor for bacterial growth in foods.
Thus, the correct answer is Water.