Which of the Following Sentences Is the Best Example of the Use

Multiple Choice

Which of the following sentences is the best example of the use of unfamiliar words?

A) I'm so glad I didn't have to go to work today.
B) The memo was sent out to the employees.
C) The festivities will culminate with the display of fireworks.
D) My best try was not good enough.
E) I want to post these letters.