Template DNA complements mRNA codon for histidine Steps:

• Identify mRNA codons for histidine: CAU and CAC.
• Determine template DNA: antiparallel complement, replacing U with A/T pairing.
• For CAU mRNA (5'-CAU-3'), template is 3'-GTA-5', written as GTA.
• Compare to options: GTA matches choice C.

Why C is correct:

• GTA is the direct complement to mRNA codon CAU per base-pairing rules (C-G, A-T, U-A).

Why the others are wrong:

• A: CAU is the mRNA codon sequence, not the DNA template.
• B: CGT templates mRNA GCA, which codes for alanine.
• D: GUA includes uracil, invalid in DNA (uses thymine instead).

Final answer: C