Which sentence from the selection best reflects the central idea?
A In April 2019, hundreds of firefighters fought to save Notre Dame Cathedral in Paris, France.
B But in the near future, drones and other types of robots will do so much more to prevent damage and save lives during fires.
C In November 2018, a few days after California’s deadly Camp Fire started, Tom Calvert arrived on the scene.
D Pennypacker has spent most of his career staring into space, searching for exploding stars called supernovae.