The correct answer is the Preoperational stage.

According to Jean Piaget's theory of cognitive development, children in the preoperational stage (which typically spans from ages 2 to 7 years) exhibit a cognitive characteristic known as transductive reasoning (or magical thinking).

Transductive reasoning involves drawing causal connections between two specific, unrelated events simply because they occurred close together in time. In this scenario:
1. Rama was mean to her brother Tahir (Event A).
2. Tahir got sick the next day (Event B).
Because Event B followed Event A, Rama reasons from specific to specific and incorrectly concludes that her mean behavior caused her brother's illness. This subjective, non-logical connection is a hallmark of preoperational thought.

Here is why the other stages of cognitive development are not correct:
- Sensorimotor stage (birth to 2 years): Infants understand the world through basic sensory experiences and physical interactions, rather than forming verbalized causal beliefs about social behaviors and illnesses.
- Concrete operational stage (7 to 11 years): Children in this stage begin to think logically about concrete events. They understand objective physical causes and would recognize that illnesses are caused by germs or viruses, not by someone being mean.
- Formal operational stage (11 years and older): Adolescents develop abstract and hypothetical-deductive reasoning, allowing them to systematically analyze cause-and-effect relationships and easily dismiss superstitious links.