Teachers were strict in Shakespeare's day, and the school day was long.
Explanation:
The first option doesn't make sense in the context.
If you think about the third option, its not the teachers being strict that cause the school day to be longer, they are two separate facts. Because of this, "Teachers were strict in Shakespeare's day, and the school day was long." makes the most sense.
Teachers were strict in Shakespeare's day, and the school day was long.
Explanation:
This is the best way to combine these two sentences. In this text, the author wants to convey two different ideas. He tells us that teachers were strict in Shakespeare's day. However, he also tells us that the school day was very long. These two ideas are not closely related to each other, but can be put together in the same sentence. Therefore, the best way to combine them would be by using the word "and."
