C. The events actually took place over the course of several years, not over a short time as Shakespeare suggests.
Shakespeare's play "Julius Caesar" is heavily based on Plutarch's "Lives of Noble Grecians and Romans." In "Lives of Noble Grecians and Romans", Plutarch shows that the events took place over the course of some years, but that sort of format would have been impossible for a 3 hour play. So Shakespeare had to change it to be over a short period of time.
D. the reader. The reader will always be the one you're writing for, since the idea of writing, especially academic writing, is usually meant for others to read.