Choose one sentence that has the same meaning to the root one:
People think that over 19,000 plant species around the globe are classified as endangered.
It was thought that over 19,000 plant species around the globe are classified as endangered.
Over 19,000 plant species around the globe are thought to be classified as endangered.
People are thought that over 19,000 plant species around the globe are classified as endangered.
Over 19,000 plant species around the globe are thought to classify as endangered.
Over 19,000 plant species around the globe are thought to be classified as endangered.