Hi again! Let’s go over the meanings of each phrase.
A. Biodiversity - Meaning life variation, biodiversity refers to the amount of variation in the entire biosphere/world. This is right!
B. Ecosystem diversity - This type of diversity refers to the amount of variation in an ecosystem — NOT THE ENTIRE BIOSPHERE. This is wrong.
C. Genetic diversity - This refers to the amount of variation in the genomes of organisms and is extremely similar to species diversity. This is wrong!
D. Species diversity - This refers to the amount of variation among a set group of species and is highly specific. This is wrong!
I hope I helped!
By the way, each of these are a form of biodiversity.