Which Assumption, If Considered, Is the MOST Serious and Unwarranted

Multiple Choice

Which assumption, if considered, is the MOST serious and unwarranted assumption made in the description of the mock website Deep Mind Therapy that would likely change a critical thinker's decision about whether to use it?

A) High-quality research has shown it to be effective.
B) It is really based on the ideas of C. G. Jung.
C) Mandalas are a real mode of expression found around the world.
D) C. G. Jung and Sigmund Freud agreed about the nature of the unconscious mind.