When a Solution of DNA in Water Is Heated, the Double

When a solution of DNA in water is heated, the double helix separates into two single strands. This process is called melting. What can be deduced from this information about the signs of the enthalpy and entropy changes for DNA melting?

A) ( $\Delta$ H > 0 and $\Delta$ S > 0)
B) ( $\Delta$ H > 0 and $\Delta$ S < 0)
C) ( $\Delta$ H < 0 and $\Delta$ S > 0)
D) ( $\Delta$ H < 0 and $\Delta$ S < 0)
E) This information is not sufficient to determine the signs of $\Delta$ H and $\Delta$ S.