I'm not sure what the lesson is, but the answer that makes sense the most is number. Number because most lessons in subject-verb agreement concerns the singularity and plurality of the subject at hand
Answer:
Ophelia's grave
Explanation:
In Hamlet, by William Shakespeare, there is a conflict between Hamlet and Laertes where they are engaged in a duel.
In the course of the duel, they both jump into Ophelia's grave in a fight to the death. Hamlet tells Laertes that he loves Ophelia and would "eat a crocodile for her" and be "buried alive with her".
a. three major supporting details.
There are three supporting details for the main idea on the theories to explain why people yawn. Each of the supporting details contains a key word or phrase to indicate that they indeed are a main supporting detail. These key words and phrases are "One explanation is...", "A second theory...", and "Yet another explanation...". These all show the supporting detail is contained in the sentence. The last sentences just build and connect to information that has already been introduced.
