Which of the following double-stranded DNA molecules would denature at a lower temperature than the 40 base-pair double-stranded molecule described above?

• A. a 40 base-pair molecule in which 25% of the bases are adenines
• B. a 30 base-pair molecule in which 40% of the bases are guanines
• C. a 20 base-pair molecule in which 10% of the bases are thymines
• D. a 10 base-pair molecule in which 20 % of the bases are cytosines