The answer is alliteration.
—Evidence—
•-Alliteration definition: the occurrence of the same letter or sound at the beginning of adjacent or closely connected words.
•- In the first part where it says “Today’s class will be silly, simple and singlehandedly...” it mentioned the same letter which is the letter S.
Answer: lay
Explanation: A subject is a part of a sentence that contains the person or thing performing the action (or verb) in a sentence. So “lay” is the verb and the verb in a sentence is the action.