What is common to A. All are endangered species of India.
B. All are keystone species.
C. All are mammals found in India.
D. All the species are neither threatened nor indigenous species of India.

Talking about all three species Lantana is an angiosperm plant, Eichhornia is a hydrophytic plant also called as water hyacinth and in last is African catfish as we all fishes came in pisces phylum. And all three species are suffering from alien species invasion. Hence,
they are all endangered species in India.
Therefore, A. All are endangered species of India.