Which of the following is an effective thesis statement?

Global temperatures are rising—causing the polar ice to melt.

Physical observation shows around 20,000-25,000 bears alive today, up from 7,500 observed in the 1950s.

Lobbyists may be using the polar bear as a pawn to pass climate change legislation as well as slow natural resource development.

Researchers found an ancient polar bear jaw from 100,000 years ago, which may show bears can survive in warmer climates

Question

Which of the following is an effective thesis statement?

		

Global temperatures are rising—causing the polar ice to melt.
		

Physical observation shows around 20,000-25,000 bears alive today, up from 7,500 observed in the 1950s.
		

Lobbyists may be using the polar bear as a pawn to pass climate change legislation as well as slow natural resource development.
		

Researchers found an ancient polar bear jaw from 100,000 years ago, which may show bears can survive in warmer climates

anonymous · Answer

Well, a thesis statement is the starting of a story. Which one sounds more like a sentence to start a story?

anonymous · Answer

D,  "Researchers found an ancient polar bear jaw from 100,000 years ago, which may show bears can survive in warmer climates," sounds more like a beginning sentence, which is my guess.