Non-transcribed DNA is the coding strand, matching mRNA with U→T.

Steps:

• mRNA sequence: GAU CUG UAA CGG.
• Non-transcribed (coding) DNA strand matches mRNA but uses T instead of U.
• Replace each U with T: G A T C T G T A A C G G.
• Result: GAT CTG TAA CGG.

Why C is correct:

• Coding strand sequence is identical to mRNA with U replaced by T, per transcription rules.

Why the others are wrong:

• A: This is the template strand, complementary to mRNA (A↔U, T↔A, etc.).
• B: Incorrect substitution; starts with CAT, not matching G A U → G A T.
• D: Identical to mRNA, but DNA uses T, not U.

Final answer: C