Mark against the correct answer
`5.91-3.6=?`

Options

A. 4.65
B. 1.95
C. 1.41
D. none of these

Answer

To solve the question \(5.91 - 3.6\), we will follow these steps:

### Step 1: Align the Decimal Points
First, we need to write the numbers in a way that their decimal points are aligned. We can rewrite \(3.6\) as \(3.60\) to make it easier to subtract.

\[ \begin{array}{r} 5.91 \\ - 3.60 \\ \hline \end{array} \]

### Step 2: Subtract the Numbers
Now, we will subtract the numbers starting from the rightmost digit (the hundredths place).

1. **Hundredths place**: \(1 - 0 = 1\)
2. **Tenths place**: \(9 - 6 = 3\)
3. **Units place**: \(5 - 3 = 2\)

Putting it all together, we have:

\[ \begin{array}{r} 5.91 \\ - 3.60 \\ \hline 2.31 \\ \end{array} \]

### Step 3: Write the Final Answer
The result of \(5.91 - 3.6\) is \(2.31\).

### Conclusion
Since \(2.31\) is not one of the options given (A: 4.65, B: 1.95, C: 1.41), the correct answer is option D: none of these.