Which of the foll A. Parthenium is an endemic species of our country.
B. African catfish is not a threat to indigenous catfishes.
C. Steller’s sea cow is an extinct animal.
D. Lantana is popularly known as carrot grass

Parthenium is scientific name of carrot grass. Catfish is in the threat of being endangered due invasion of African catfish. So, Stellar’s sea cow is now in the list of extinct animals due to over exploitation of humans.
Therefore, C . Stellar’s sea cow is an extinct animal.