The correct option is
A trisaccharide
When carbohydrates on hydrolysis yield more than two to ten monosaccharides, they are known as oligosaccharides. Therefore trisaccharides are basically oligosaccharides.
Raffinose(C18H32O16) is a trisaccharide as it contains 3 monosaccharide units. On hydrolysis it gives glucose+fructose+galactose. It is mostly found in beans, cabbage, broccoli etc. Refer the above figure for the structure of raffinose.