The correct option is A Disaccharides
Condensation of two monosaccharides results in the formation of glycosidic bond between them and thus gives rise to a disaccharide. Diasaccharides include maltose, sucrose, etc.
Oligosaccharides are formed by the condensation of very few monosaccharides (approximately 3-10 monosaccharides). These include trisaccharides, tetrasaccharides, etc.
Monosaccharides linked in a long chain and form a polysaccharide. Cellulose is a polysaccharide.