To find the percentage of shoes that are rejected, you can use the formula:
\[ \text{Percentage rejected} = \left(\frac{\text{Number of rejected pairs}}{\text{Total number of pairs}}\right) \times 100 \]
Given that 3 out of every 200 pairs are rejected:
\[ \text{Percentage rejected} = \left(\frac{3}{200}\right) \times 100 \]
Calculating that:
\[ \text{Percentage rejected} = 0.015 \times 100 = 1.5% \]
Therefore, the correct answer is 1.5%.