The choices can be found elsewhere and as follows:
A. an oxygen.
B. a hydroxyl group.
C. one or more phosphate groups.
D. an amino group.
E. a hydrogen.
I believe the correct answer is option B. In a deoxyribonucleotide, it is the chemical group hydroxyl is found at the 2' carbon of the sugar component. Hope this answers the question. Have a nice day.