In the first paragraph under The Chunnel, the author states, "It had to be strong and waterproof." What is the purpose of this statement?
A. It is her central claim about the Chunnel project.
B. It is the piece of evidence she relies on to support her central claim about the Chunnel project.
C. It is her reasoning connecting her evidence back to her central claim about the Chunnel project.
Dit is her counterargument to the claim that the Big Dig was the most amazing engineering project​