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 say C

I agree.

To answer this question, we need to consider the information provided in the passage and make an inference based on previous research.

According to the passage, one group of rats is living in a traditional cage with basic amenities, while the second group is in an enriched environment with toys, exercise wheels, and human interaction.

In previous research, it has been observed that an enriched environment can have positive effects on the cognitive abilities of rats, such as improved learning and memory. The enriched environment provides stimulation and opportunities for the rats to engage in cognitive activities, which may result in improved performance on intelligence tests.

Therefore, based on this information, it is reasonable to conclude that the rats in the second group, which lived in the enriched environment, are expected to perform better on an intelligence test compared to the rats in the first group.

Hence, the correct answer is C: the rats in the second group are expected to make a higher score on an intelligence test.