In which of the following cases, cooking is very slow ?

Options

A. pressure cooker at sea level
B. pressure cooker at higher altitude
C. open vessel at sea level
D. open vessel at higher altitude

Explanation

To determine in which case cooking is very slow, we need to analyze the effects of pressure and temperature on the cooking process.

### Step-by-Step Solution:

1. **Understanding Cooking Conditions**:
- Cooking involves heating food to a certain temperature to make it edible. The rate of cooking can be influenced by the pressure and temperature of the cooking environment.

2. **Pressure Cooker vs. Open Cooking**:
...