Which of the following graphs cannot be a time temperature graph?

Options

A.
B.
C.
D.

Answer

To determine which of the given graphs cannot be a time-temperature graph, we need to analyze the characteristics of time and temperature in such graphs.

### Step-by-Step Solution:

1. **Understanding Time-Temperature Graphs**:
- A time-temperature graph plots time on the x-axis and temperature on the y-axis.
- Time is always increasing; it cannot decrease or remain constant over a period.

2. **Analyzing the Options**:
- We need to examine each option to see if any graph shows time remaining constant or decreasing.

3. **Option 1**:
- In this graph, time is increasing, and temperature is also increasing.
- This is a valid scenario as both time and temperature can increase.

4. **Option 2**:
- In this graph, time is increasing, but at a certain point, the temperature remains constant (flat line).
- This means that for a period of time, the temperature does not change, which is possible. Thus, this graph is valid.

5. **Option 3**:
- In this graph, time is increasing, and the temperature is decreasing.
- This is also a valid scenario as time can continue to increase while temperature drops.

6. **Identifying the Invalid Graph**:
- If any graph shows time remaining constant (a flat line on the time axis), it cannot be a valid time-temperature graph.
- If we find a graph where time does not increase (flat line), that graph is invalid.

7. **Conclusion**:
- After analyzing the options, we find that **Option 2** is the graph where time appears to stop (constant), making it the invalid time-temperature graph.

### Final Answer:
- The graph that cannot be a time-temperature graph is **Option 2**.