It is estimated that out of the total global warming the relative contribution of `CO_(2)`, `CH_(4)` CFCs and `N_(2)O` are found respectively as:

Options

A. 20%,14%,60%,6%
B. 14%,6%,20%,60%
C. 60%,20%,14%,6%
D. 6%,14%,20%,60%

Answer

To solve the question regarding the relative contribution of various greenhouse gases to global warming, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Greenhouse Gases**: The question mentions four greenhouse gases: Carbon Dioxide (CO2), Methane (CH4), Chlorofluorocarbons (CFCs), and Nitrous Oxide (N2O).

2. **Understand Their Contributions**: We need to determine the estimated contribution of each gas to global warming. Based on scientific estimates:
- CO2 is the most significant contributor.
- CH4 contributes less than CO2 but is still significant.
- CFCs are potent greenhouse gases but are less prevalent than CO2 and CH4.
- N2O contributes the least among the gases listed.

3. **Assign Percentage Contributions**:
- CO2: Approximately 60%
- CH4: Approximately 20%
- CFCs: Approximately 14%
- N2O: Approximately 6%

4. **Compile the Results**: Based on the contributions identified, we can summarize the relative contributions as:
- CO2: 60%
- CH4: 20%
- CFCs: 14%
- N2O: 6%

5. **Select the Correct Option**: From the options provided, the correct sequence of contributions is 60% for CO2, 20% for CH4, 14% for CFCs, and 6% for N2O.

### Final Answer:
The relative contributions of CO2, CH4, CFCs, and N2O to global warming are approximately:
- CO2: 60%
- CH4: 20%
- CFCs: 14%
- N2O: 6%