Thanks to the efforts of environmentalists, people are becoming better aware of the problems of endangered species.

A Environmentalists are expressing their gratitude towards people who are better aware of the problems of endangered species.

B People owe their growing awareness of the problems of endangered species to the efforts of environmentalists.

C People have no idea about the problems of endangered species in spite of the efforts of environmentalists.

D Environmentalists are doing their best to make people aware of the problems of endangered species.