Definition: You are given a paragraph, a question and some answer options (associated with "A", "B", "C", "D", etc.) You need to list all the correct answer options with their associated letters (e.g. "A" can be a valid answer). Note that sometimes, more than one option can answer the question correctly and completely. In those cases, please generate all such options separated by a comma (e.g. "A, B" is a valid answer). Do not generate anything else apart from one or more of the following characters: 'A', 'B, 'C', 'D', etc.
Input: Paragraph- Sent 1: Patricia Cross and her boyfriend Larry Osborne , two students in a San Francisco school , become expelled for the publication of an off-campus underground paper .
Sent 2: As a result , a philosophy professor , Dr. Jonathon Barnett , resigns his teaching position and decides to become an advocate for the counterculture youth movement and , specifically , the use of LSD .
Sent 3: The hippies of the Haight-Ashbury district first see him as a hero and then as something even more .
Sent 4: Dr. Barnett even makes an appearance on the Joe Pyne TV show to voice his support of the hippie community and the use of LSD .
Sent 5: One scheming young man sees the opportunity to build Dr. Barnett as the head of a cult centered around the use of LSD .
Sent 6: He hopes to earn profit from the users , Dr. Barnett's speeches known as `` happenings , '' and their lifestyles .
Sent 7: At a massive LSD-fueled dance , Patricia begins to have a bad trip Which leads to an argument between her and Pat , ultimately splitting the couple up .
Sent 8: After Patricia realizes that she's pregnant , Dr. Barnett advises her to have an abortion , ultimately leading to Patricia attempting suicide .
Sent 9: However , Larry saves her and makes the destruction of Dr. Barnett's cult his primary objective .
Sent 10: Larry shoots Dr. Barnett from the crowd at one of his massive speeches .
Sent 11: As another hippie in attendance calms the audience and Elliot sees his new leader for their cult-like organization , Larry realizes that his assassination of Dr. Barnett simply made him a martyr for the hippie movement . 
Question: Who is the person using voice his support of the hippie community and cult centered around the use of LSD? (A) Movement (B) Support (C) Dr.Barnett (D) Elliot.
Output:
C, D.