What's the difference between monosomy and trisomy?

Trisomies and monosomies are two types of chromosomal abnormalities. Specifically, a trisomy is when a person has three of a particular chromosome, instead of the usual two. A monosomy is when they just have one chromosome instead of the usual two.

For example: A trisomy is down syndrome

Explanation:

trisomy is when a person has three of the particular chromosome rather than two. Monosomy is when someone has one chromosome rather than the usual two.

if you listed your answers right then i believe your answer is b.