Which of the Following Describes a Function of the DNA

Which of the following describes a function of the DNA helicase?

A) connects the Okazaki fragments and seals any breaks in the sugar-phosphate backbone
B) adds nucleotides to the growing 3' end of the new DNA strand
C) creates the lagging strand in semiconservative replication
D) unwinds and "unzips" the double-stranded DNA by breaking the weak hydrogen bonds between the paired bases
E) re-creates the broken hydrogen bonds so that DNA becomes double-stranded again