Arrange the following steps in proper sequence for the construction and calibration of Celsius thermometer.
(A) Lower fixing point is marked by immersing the bulb of the thermometer in melting ice taken in a funnel.
(B) The distance between the two fixed points is called fundamental interval. It is divided into 100 equal divisions in Celsius scale.
(C) Take a thick walled capillary tube with thin walled glass bulb and fill it with mercury with the help of a funnel.
(D) Mark the upper fixing point with the help of hypsometer.
(E) Place the glass bulb in a hot oil bath while filling the mercury to remove the air bubbles.

Options

A. C A D E B
B. C E A D B
C. C E A B D
D. C D B E A

Explanation

To arrange the steps for the construction and calibration of a Celsius thermometer in the correct order, we will follow the logical sequence of actions involved in the process.

### Step-by-Step Solution:

1. **Step C**: Take a thick-walled capillary tube with a thin-walled glass bulb and fill it with mercury with the help of a funnel.
- This is the initial step where we prepare the thermometer by filling the capillary tube with mercury.

2. **Step E**: Place the glass bulb in a hot oil bath while filling the mercury to remove the air bubbles.
- After filling the tube with mercury, we need to ensure that there are no air bubbles, which could affect the accuracy of the thermometer. The hot oil bath helps in this process.

3. **Step A**: Lower fixing point is marked by immersing the bulb of the thermometer in melting ice taken in a funnel.
- The next step is to establish the lower fixed point of the thermometer. This is done by immersing the bulb in melting ice, which represents 0°C.

4. **Step D**: Mark the upper fixing point with the help of a hypsometer.
- After marking the lower fixed point, we need to determine the upper fixed point, which is typically done using a hypsometer, often at the boiling point of water (100°C).

5. **Step B**: The distance between the two fixed points is called the fundamental interval. It is divided into 100 equal divisions in the Celsius scale.
- Finally, we establish the scale of the thermometer by dividing the distance between the two fixed points into 100 equal parts, which corresponds to the Celsius scale.

### Final Sequence:
The correct order of steps is: **C, E, A, D, B**.