The answer is: A. Ivan Pavlov
Pavlov was the researcher who first popularized the classical conditioning (where a certain conditioned response is created by associating a certain situation with a conditioned stimulus)
Counterconditioning was developed in order to reverse or reduce the effete of classical conditioning (usually carried out by enforcing positive reinforcement to the subjects)
Abstract art is popular because it has a purpose in this world both for the artist and the viewer. Many people collect abstract paintings to beautify their surroundings, as an investment, or to update their lives with contemporary culture. ... Abstract art also covers a broad spectrum of painting styles. Abstract art can also be made with many materials and on many surfaces. It can be used in concert with representational art or completely abstract. Artists creating it often focus on other visual qualities like color, form, texture, scale and more in their nonobjective work.
The answer is C. 480 BC - 146 BC
Benjamin Franklin took a great interest in health-related topics by applying Enlightenment reasoning to his study of various afflictions and came up with some astonishingly accurate hypotheses. Benjamin Franklin insights and productivity was in medicine where he saw the value in vaccination against smallpox and was aware of the placebo effect. He launched the first American medical school and devised a flexible urethral catheter. He also identified lead poisoning as a cause of abdominal pain and peripheral neuropathy. He further accurately described psoriasis well before Robert Willan. These contributions by Benjamin Franklin in healthcare may be said to be significant and satisfactory.
