Match List I with List II and select the correct answer using the codes given below the lists:
`{:(,"List I",,,"List II"),(P.,"Boltzmann constant",,1.,[ML^(2)T^(-1)]),(Q.,"Coefficient of viscosity",,2.,[ML^(-1)T^(-1)]),(R.,"Planck constant",,3.,[MLT^(-3)K^(-1)]),(S.,"Thermal conductivity",,4.,[ML^(2)T^(-2)K^(-1)]):}`

Options

A. `P=3, Q=1, R=2, S=4`
B. `P=3, Q=2, R=1, S=4`
C. `P=4, Q=2, R=1, S=3`
D. `P=4, Q=1, R=2, S=3`

Explanation

To solve the problem of matching List I with List II, we need to determine the dimensional formulas for each of the physical constants given in List I and then find the corresponding match in List II.

### Step-by-Step Solution:

1. **Identify the Boltzmann Constant (P)**:
- The Boltzmann constant (k) relates energy at the particle level to temperature. Its dimensional formula is:
\[ [k] = [ML^2T^{-2}K^{-1}] \]
- **Match**: This corresponds to option 4 in List II.

2. **Identify the Coefficient of Viscosity (Q)**:
- The coefficient of viscosity (η) measures a fluid's resistance to flow. Its dimensional formula is:
\[ [η] = [ML^{-1}T^{-1}] \]
- **Match**: This corresponds to option 2 in List II.

3. **Identify the Planck Constant (R)**:
- The Planck constant (h) relates energy to frequency. Its dimensional formula is:
\[ [h] = [ML^2T^{-1}] \]
- **Match**: This corresponds to option 1 in List II.

4. **Identify the Thermal Conductivity (S)**:
- Thermal conductivity (k) measures a material's ability to conduct heat. Its dimensional formula is:
\[ [k] = [MLT^{-3}K^{-1}] \]
- **Match**: This corresponds to option 3 in List II.

### Summary of Matches:
- P (Boltzmann constant) → 4
- Q (Coefficient of viscosity) → 2
- R (Planck constant) → 1
- S (Thermal conductivity) → 3

### Final Matching:
Thus, the final matching is:
- P → 4
- Q → 2
- R → 1
- S → 3

### Answer:
The correct code for the matches is **4 2 1 3**.