Select the sentence which contains one independent clause and one subordinate clause.
A) My mother sternly warned me not to get into trouble at school, but I found that I couldn't help myself.
B) Even though my mother sternly warned me not to get into trouble at school, I found that I couldn't help myself.
C) My mother sternly warned me not to get into trouble at school; I found, however, that I couldn't help myself
D) My mother sternly warned me not to get into trouble at school, I found that I couldn't help myself.