Solve the Subtraction Problem: 17 Units Minus 8 Units

To solve this problem, we'll follow these steps:

• Identify the minuend and subtrahend.
• Perform the subtraction operation.
• Verify the result with the provided answer choices.

Now, let's work through each step:
Step 1: The given numbers are 17 (minuend) and 8 (subtrahend).
Step 2: Using the subtraction formula, we calculate $17 - 8 = 9$.
Step 3: Cross-reference the result with the provided answer choices to ensure it matches choice 4, which is 9.

Therefore, the solution to the problem is $9$.