Which of the Following Errors Is Most Likely to Be

Which of the following errors is most likely to be the result of production compilation?

A) When asked for the capitol of California, you mistakenly say "San Francisco."
B) You need to stop at the post office, but you forget as you drive your normal route home from school.
C) After taking a course in Chinese, you forget the rule for future perfect tense in Russian.
D) You find it difficult to learn your lines for an off-Broadway play.