In 1918 H1N1 Or "The Spanish Flu" emerged and was extremely contagious. It was a Novel Virus just as SARS-CoV-2 (Coronavirus) is. Within months H1N1 spread to almost every country on the planet and was considered a Pandemic. The reason it was called "The Spanish Flu" is because Spain was the only country to report this in their news media. similar to what china tried to do by not reporting about the virus at first. The reason the 1918 was so deadly was because it emerged right as World War 1 ended and soldiers where moving all across the planet to return from the war to their home country which made the virus spread like wildfire and now with SARS-CoV-2 millions of people travel to the other side of the planet within hours daily which made it spread so fast.
"bi" means 2: so bi-cameral means with two "cameras" - two chambers, answer B!
a legislative body with only one chamber would be called uni-cameral: "uni" meaning "1", or "unique"
The Colorado River was like otherwise rivers but due to overuse for it's water to humans and agriculture and also with the poor manegnent of the river, The rivers has become an environmental problems, Threatening species around the river that Daily depended on the vezitation and fresh water it got from the river. The river is expected to have it's water flow cut completely soon so that will also mean the shut down of hydroelictric dams.
I hope I was a help.
The answer to your question would be C.