Malcolm is writing a report about Canadian and American immigrants. Below is his report.

Since 1820, lots and lots of Canadians have moved to America. The biggest reason is because of work. America has more jobs than Canada. Americans also move to Canada. Canada has cleaner air, and life is quieter.

What part of Malcolm's report should be changed because it is not precise?
A.
"Canada has cleaner air, and life is quieter."
B.
"The biggest reason is because of work."
C.
"Since 1820, lots and lots of Canadians have moved to America."
D.
"Americans also move to Canada."