Here are the answers to your questions:
Question 1
A) Which option must be placed between coordinate adjectives?
Response: commas
Question 2
A) Which sentence contains coordinate adjectives?
Response: Lucy made creative, colorful Valentine’s Day cards for all of her classmates.
Question 3
A) Which sentence contains coordinate adjectives that should be separated by commas?
Response: The bus was hot, crowded, and loud, so we decided to get off and walk.
Question 4
A) Which sentence is punctuated correctly?
Response: Before gym class, the students seem happy, excited, and ready to play.
Feel free to ask if you have additional questions!