Step 1: From the given graph:
- The number of people working in the IT department of organization A is 600.
- The number of people working in the exports department of organization B is 500.
Step 2: The respective ratio of the number of people working in the IT department of organization A to the number of people working in the exports department of organization B is:
\[
\text{Ratio} = \frac{600}{500} = \frac{6}{5}
\]
Thus, the correct answer is 8:3.