The correct order of the size of C, N, P, S following the order:

Options

A. N > C > P > S
B. C > N > S > P
C. C > N > P > S
D. N < C < S < P

Explanation

To determine the correct order of the size of the elements Carbon (C), Nitrogen (N), Phosphorus (P), and Sulfur (S), we need to analyze their positions in the periodic table and understand how atomic size changes across periods and down groups.

### Step-by-Step Solution:

1. **Understanding Atomic Size Trends**:
- Atomic size decreases from left to right across a period due to the increase in effective nuclear charge (Z-effective). As protons are added to the nucleus, the attraction between the nucleus and the outer electrons increases, pulling them closer and reducing the atomic size.
- Atomic size increases down a group because additional electron shells are added, which increases the distance between the nucleus and the outermost electrons, leading to a larger atomic size.

2. **Identifying the Position of the Elements**:
- Carbon (C) is in Group 14 (2nd period).
- Nitrogen (N) is in Group 15 (2nd period).
- Phosphorus (P) is in Group 15 (3rd period).
- Sulfur (S) is in Group 16 (3rd period).

3. **Comparing Sizes**:
- **Carbon (C)**: Being the furthest left in the group, it has the largest size among the four elements.
- **Nitrogen (N)**: Next to Carbon, but it is smaller than Carbon due to the increase in nuclear charge.
- **Phosphorus (P)**: Located below Nitrogen, it will be larger than Nitrogen but smaller than Carbon due to the addition of a new electron shell.
- **Sulfur (S)**: Located below Oxygen and in the same period as Phosphorus, it will be larger than Nitrogen and smaller than Phosphorus.

4. **Final Order of Sizes**:
- From largest to smallest, the order is: **C > P > N > S**.

### Conclusion:
The correct order of the size of Carbon, Nitrogen, Phosphorus, and Sulfur is **C > P > N > S**.