Tick the correct answer:
The bread or idli dough rises because of

Options

A. heat
B. grinding
C. growth of yeast cells
D. kneading

Explanation

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks why the bread or idli dough rises. We need to identify the correct reason from the options provided.

2. **Identifying the Key Process**: The rising of dough is primarily due to a biological process involving yeast. Yeast is a unicellular organism that plays a crucial role in fermentation.

3. **Role of Yeast**: When yeast is added to the dough, it begins to consume the sugars present in the dough. This process is known as fermentation.

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