Just took the test on Edu 2020
Dr. Lanyon is characterized as friendly is this excerpt and we can find evidence in it to support the idea. The author uses adjectives to describe his appearance and personality so we can infer he is a friendly man. The adjectives that reflect this are: “hearty, dapper, boisterous and decided manner”. Also the phrase “welcomed him with both hands” and “it reposed on genuine feeling” provides an idea of a sincere and friendly person.
Therefore, the other 3 options do not reflect the personality and appearance of Dr. Lanyon since there is no evidence in the text that Dr Lanyon is arrogant, wise or mournful.