Viktor E. Frankl, Karl Jaspers, and Medard Boss

Viktor E. Frankl, Karl Jaspers, and Medard Boss:

A. popularized client-centered therapy
B. used existentialism to understand human nature
C. reconciled faith and science
D. showed that effective living depends on effective myths

Correct answer is option B. Explanation: Viktor E. Frankl, Karl Jaspers, and Medard Boss used existentialism to understand human nature.