Please help me with the following problem:

**Find the greatest possible error for each measurement.**

**4 1/2 oz**

**A. 1/4 oz**

**B. 2 1/2 oz**

**C. 1 oz**

**D. 2 1/4 oz**

I know it is not B(I got it wrong.), but I think it is A. Is this correct?

Please help me by checking my answer. Any help is appreciated!!! :)