The correct option is D Is a helix
In 1962, James Watson, Francis Crick, Rosalind Franklin, and Maurice Wilkins jointly received the Nobel prize in Physiology or Medicine for their 1953 determination of the structure of Deoxyribonucleic acid. It was determined that DNA consists of two chains twisted around each other, or double helices, of alternating phosphate and sugar groups, and that the two chains are held together by hydrogen bonds between pairs of organic bases.