The solution in which the blood cells remain their normal shape, with regard to the blood, are

Options

A. Isotonic
B. Hypertonic
C. Hypotonic
D. None of these

Explanation

To solve the question regarding the type of solution in which blood cells maintain their normal shape, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Blood Cells in Solutions**:
- Blood cells, such as red blood cells, can change shape depending on the type of solution they are placed in. The three types of solutions are isotonic, hypertonic, and hypotonic.

2. **Defining Isotonic Solution**:
- An isotonic solution is one that has the same concentration of solutes as the inside of the blood cells. This means that the osmotic pressure is equal inside and outside the cells.

3. **Effect of Isotonic Solution on Blood Cells**:
- When blood cells are placed in an isotonic solution, there is no net movement of water into or out of the cells. Therefore, the cells retain their normal shape and size.

4. **Comparison with Other Solutions**:
- In a **hypertonic solution**, the concentration of solutes outside the cell is higher than inside, causing water to move out of the cells, leading to cell shrinkage.
- In a **hypotonic solution**, the concentration of solutes outside the cell is lower than inside, causing water to move into the cells, which can lead to swelling and potentially bursting.

5. **Conclusion**:
- Since the question asks for the type of solution in which blood cells maintain their normal shape, the correct answer is **isotonic solution**.

### Final Answer:
The solution in which the blood cells remain their normal shape is **isotonic solution**.