Final answer:
The school counselor should assure Jenna's mother that the situation will be addressed, observe the students' behavior, and meet with the students who are mistreating Jenna in a group to discuss their behavior.
Step-by-step explanation:
The school counselor should take action B. Assure Jenna's mother that the situation will be addressed, observe for herself these students' behavior toward Jenna, and then meet with the students who are mistreating Jenna in a group to discuss their behavior.
This action acknowledges the seriousness of the mistreatment, ensures that the mother feels heard and supported, and allows the counselor to gather firsthand information about the students' behavior. By meeting with the students as a group, the counselor can address the issue directly and discuss the consequences of their actions.