[Solved] Which of the following fuels could not be used in flexible fuel vehicles (FFV's) A) gasoline B) ethanol C) compressed natural gas D) hydrogen E) none of these answer choices is correct Classical Conditioning: A learning process that occurs when two stimuli are repeatedly presented together, resulting in a conditioned response to a previously neutral stimulus. Voyeurism: The practice of gaining sexual pleasure from observing others when they are naked or engaged in sexual activity. Rational-emotive Therapist: A mental health professional who practices Rational-Emotive Behavior Therapy (REBT), focusing on identifying and changing irrational beliefs. Negative Self-image: A subjective view of oneself that is critically poor, flawed, or fundamentally negative, often leading to low self-esteem.