Answer:
Richard's most likely response to Maria's concern according the information we have about his character is right after school. The correct answer is the last one.
Step-by-step explanation:
As it is said in the first sentence, Richard is known for his good academic habits, and Maria is telling him that she is not a morning person, so he would never advise her to study late at night or before school. Also, Maria is telling Richard that on the weekends she volunteers at an animal shelter, so she wouldn't be able to study on the weekends either. Her best choice, Richard would say, is to study right after school since she has some free time there and also it is recommended to study right after the class because students have all the ideas very fresh in their minds and remember everything with more details.