To find the percentage error, use the formula:

\[
\text{Percentage Error} = \left( \frac{\text{Measured Value} - \text{Actual Value}}{\text{Actual Value}} \right) \times 100
\]

Here, the measured value is \(5.60\) m and the actual value is \(5.55\) m.

\[
\text{Percentage Error} = \left( \frac{5.60 - 5.55}{5.55} \right) \times 100
\]

\[
\text{Percentage Error} = \left( \frac{0.05}{5.55} \right) \times 100 \approx 0.9\%
\]

Thus, the answer is:

D. 0.9%