Solve Decimal Division: 23.1 ÷ 10 = ?

To solve this problem, let's follow a simple approach using the decimal shifting rule:

• Step 1: Identify the initial decimal point position in 23.1, which is between '3' and '1'.
• Step 2: To divide by 10, move the decimal point one position to the left.

Now, moving the decimal point one place to the left converts 23.1 to 2.31.

Therefore, the solution to the problem is $2.31$, which corresponds to choice .