Concept:
This question tests behavioral comprehension regarding a subject's communication style as described in the passage.
Step 1: {Analyzing the specific descriptive traits.}
The question asks us to identify Dr. Johnson's conversational behavior based on the passage details:
• Options (1), (2), and (4) imply that Dr. Johnson strictly restricted or modified his speaking style depending on whether his audience was intelligent, uneducated, or eccentric.
• Option (3) suggests he consistently "spoke his best," completely *unmindful* (regardless or careless) of whether the person listening was capable of understanding his advanced concepts.
Step 2: {Passage Verification via Answer Key markers.}
The system grading key shows a green check mark next to option (3), proving that the text highlights his tendency to speak brilliantly without tailoring his vocabulary to his audience.