Step 1: Meaning
D and L describe the configuration at the highest-numbered chiral carbon, compared with glyceraldehyde. In D-sugars the OH on that carbon is on the right in the Fischer projection.
Step 2: Not related
It does not mean dextrorotatory. A D-sugar can rotate light either way. It has nothing to do with magnetism or synthesis.
Final Answer:
D denotes configuration.
\[ \boxed{\text{(B)}\ \text{configuration}} \]