Final answer:
A faculty advisor typically approves a Chief Student Leader's and Treasurer's request to join an organization, although the principal may also be involved. The Student Council and the Parent Teacher Association may have limited role in the approval process based on the school's policies.
Step-by-step explanation:
The authority to approve a Chief Student Leader's and Treasurer's request to join an organization typically varies based on the organizational structure of the educational institution. However, the most common and likely answer is: 2) Faculty Advisor. In many cases, student organizations within schools or colleges operate under the guidance of a faculty advisor. The faculty advisor, who is a member of the school's staff, often plays a crucial role in overseeing and guiding student activities. The approval process for joining an organization may involve consultation with the faculty advisor, who ensures that the student leaders' requests align with the institution's policies and guidelines.