During calls home every two weeks, my mother pleaded with me to take chemistry or biology. A.
When I made phone calls home every two weeks, my mother urged me to major in chemistry or biology. B.
In the telephone conversations I had with my mother every two weeks, she encouraged me to switch from chemistry to biology. C.
When I made phone calls home every two weeks, my mother urged me not to major in chemistry or biology. D.
In the telephone conversations I had with my mother every two weeks, she encouraged me to abandon chemistry to biology.