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a. Amino acids undergo condensation reactions to form polysaccharides.
b. Monosaccharides undergo condensation reactions to form polysaccharides.
c. Monosaccharides undergo hydrolysis to form polysaccharides.
d. Glucose is the monomer for all polysaccharides.

the answer is B.

Here's why:
A:  Amino acids come together to form POLYPEPTIDES, not polysaccharides.  Amino acids are also the building blocks of PROTEINS, not sugars.

B:  Mono means "one".  Poly means multiple.  Water is a byproduct of the formation of a bond between two monosaccharides.  This is why they call it a condensation reaction (water is produced).  The bonded monosaccharides are now a disaccharide (di meaning "two").  Further condensation reactions result in a polysaccharide, a chain of monosaccharides.

C:  Hrodrolysis = "Water splitting".  In a hydrolysis reaction, water is incorporated into a compound to break a bond.  These reactions use water to make smaller compounds from bigger ones.  Monosaccharides are smaller than polysaccharides, so Choice C doesn't make sense.

D:  There are other monomers for polysaccharides, such as fructose.

b. Monosaccharides undergo condensation reactions to form polysaccharides.

b is the only true answer