39. The Sanger sequencing procedure uses dideoxynucleoside triphosphate (ddNTP) analogs to interrupt DNA synthesis. When a ddNTP is inserted in place of a dNTP, the strand elongation is halted, because it:(A) lacks the 5'-phsophate group needed for the next step.(B) lacks the 2'-hydroxyl group needed for the next step.(C) lacks the 3'-hydroxyl group needed for the next step.(D) possesses the additional 2'-hydroxyl group, which interrupts DNA synthesis.(E) possesses the additional 3'-hydroxyl group, which interrupts DNA synthesis.