The experimental rats were being raised in separate environments. One group lived in the traditional cage in a quiet, but well lighted room. They were supplied with plenty of food and water. The second group inhabited "Rat Disney Land." There were colorful toys, exercise wheels, and mirrors. The experimenters talked to the rats in the second group and demonstrated concern. Based on the results of previous research the researchers expected __________________.

A. The rats in the first group to exhibit depression.
B. The rats in the second group to become hyperactive and unable to focus on a task.
C. The rats in the second group to make a higher score on an intelligence test.
D. The rats in the first group to make a higher score on a test of intelligence.

I think it is a or b. I know it is not c or d.

To determine the expected outcome of the experiment, we can analyze the information given and apply logical reasoning.

The first group of rats was raised in a traditional cage with basic supplies, while the second group had a more enriched environment with toys, exercise wheels, and human interaction.

Previous research can provide valuable insights into similar experiments. However, in this case, no specific details have been provided about the previous research findings. Hence, we cannot directly rely on previous research to determine the expected outcome.

Now, let's consider the options provided:

A. The rats in the first group to exhibit depression: The traditional cage and sufficient food and water do not indicate a lack of basic necessities, so it is unlikely that the rats in the first group would exhibit depression solely based on the provided information.

B. The rats in the second group to become hyperactive and unable to focus on a task: The enriched environment in "Rat Disney Land" with various toys, exercise wheels, and human interaction may stimulate the rats, leading to increased activity levels. However, there is no direct indication that they would be unable to focus on a task.

C. The rats in the second group to make a higher score on an intelligence test: The provision of a more enriching environment may improve cognitive abilities and could potentially lead to higher scores on an intelligence test.

D. The rats in the first group to make a higher score on a test of intelligence: Based on the information provided, the traditional cage environment does not offer any particular cognitive stimulation. Therefore, it is less likely for the rats in the first group to score higher on an intelligence test.

Considering the above analysis, option B seems to be the most reasonable choice. However, it should be noted that the question does not provide definitive information to determine the precise expected outcome with complete certainty.