Assertion `:` Expressing 735 m into km, we get 735000km.
Reason`:` 1m `= ( 1)/( 1000) km`

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If assertion is false but reason is true.

Answer

To solve the problem, we need to evaluate the assertion and the reason provided.

### Step 1: Understand the Assertion
The assertion states that "Expressing 735 m into km, we get 735000 km."

### Step 2: Convert Meters to Kilometers
We know that:
1 km = 1000 m

To convert meters to kilometers, we can use the formula:
\[ \text{Kilometers} = \frac{\text{Meters}}{1000} \]

### Step 3: Apply the Conversion to 735 m
Now, we will apply the conversion to 735 m:
\[ \text{Kilometers} = \frac{735 \text{ m}}{1000} = 0.735 \text{ km} \]

### Step 4: Evaluate the Assertion
The assertion claims that 735 m equals 735000 km, which we have calculated to be 0.735 km. Therefore, the assertion is **false**.

### Step 5: Understand the Reason
The reason states that "1 m = (1)/(1000) km." This is correct because:
1 km = 1000 m implies that 1 m = 1/1000 km.

### Step 6: Evaluate the Reason
Since we have confirmed that the reason is true, we conclude that:
- The assertion is false.
- The reason is true.

### Conclusion
Thus, the correct conclusion is that the assertion is false, but the reason is true.

### Final Answer
- Assertion: False
- Reason: True