Why might it be more scientifically expedient to use a monkey rather than a human being to study the effects of environmental noise levels on problem solving? Select one: a. The experimenter has greater control using the animal. b. Monkeys have more precise hearing. c. Humans have already been studied. d. Monkeys are cheaper to house and feed.

The correct answer is a. The experimenter has greater control using the animal.<br /><br />Using a monkey rather than a human being to study the effects of environmental noise levels on problem solving might be more scientifically expedient because the experimenter has greater control using the animal. Monkeys are more likely to follow experimental protocols and are less likely to be influenced by external factors such as distractions or motivations that may affect their behavior. This allows for more precise and reliable measurements of the effects of environmental noise levels on problem solving.