Answer the following questions about the accompanying diagram.
What structure is closest to D? Be specific. 

Verified step by step guidance

1. Identify the labeled structures in the diagram: A is DNA, B is RNA polymerase, C is mRNA, D is a ribosome, E is a tRNA, F is an amino acid chain, and G is another ribosome.
2. Determine the position of structure D, which is labeled as a ribosome, in relation to other structures.
3. Observe that structure D is directly interacting with structure C, which is mRNA, as it is part of the translation process.
4. Note that structure E, labeled as tRNA, is closely associated with structure D, as tRNA brings amino acids to the ribosome during translation.
5. Conclude that the structure closest to D is E, the tRNA, as it is directly involved in the translation process at the ribosome.