Final answer:
The process of focusing awareness on a specific range of stimuli or events is referred to as Concentration, which is fundamental in many cognitive processes such as learning and decision-making.
Step-by-step explanation:
The question refers to the cognitive process that involves focusing awareness on a narrower range of stimuli or events. The correct answer is d) Concentration. Concentration is a cognitive process that involves focusing one's attention on a specific task or stimulus while excluding other irrelevant stimuli and information. This mental process is crucial in our daily activities, particularly in educational and professional settings, as it allows us to process information effectively and efficiently. In contrast, the other options listed do not align with this definition: a) Hallucination is a false perception occurring without any identifiable external stimulus; b) Delusion is a firmly held belief contrary to reality; c) Dissociation is a mental process that causes a lack of connection in a person's thoughts, memory, and sense of identity.