Which of the following sentences is correct?

A、The first time Bruno came to the U. S., he stayed in Texas, but after working as a tractor driver for several years, he moved to Chicago, and then to California after he got married.;
B、Bruno used to be a tractor driver, a welder, a punch-press operator, and a mechanic, but now he is retired.;
C、Bruno first came to the U. S. when he was 18 years old, then he went back to Mexico in 1962, but bav returned to the U. S. again in 1976.;
D、Bruno came to the U. S. from Mexico 50 years ago and never went back there again.