Choose the correct statement.

A$.$

Since$1990,$ the gap between the United States and Nigeria$$ narrowed, and since $1980$ the gap between the United States and Mexico$$ widened, and the gap between the United States and the Europe Big $4$ has not changed much.

B$.$

Since$1990,$ the gap between the United States and Russia$$ narrowed, and since $1980$ the gap between the United States and Mexico$$ narrowed, and the gap between the United States and the Europe Big $4$ has widened significantly.

C$.$

Since$1980,$ the gap between the United States and other G$7$ nations has narrowed significantly and in some cases reversed so that real GDP per person is no longer highest in the United States.

D$.$

Since$1990,$ the gap between the United States and Nigeria$$ narrowed, and since $1980$ the gap between the United States and Mexico$$ widened, and the gap between the United States and Canada has narrowed significantly.