Final answer:
In the sentence provided, 'Rolando' is the only concrete noun as it is the name of a person who can be experienced with the senses, while 'sense' and 'humor' are abstract concepts.
Step-by-step explanation:
The student is asking which noun in the sentence "I have always admired your sense of humor," Rolando said. is a concrete noun. In this sentence, the options are sense, humor, and Rolando. A concrete noun refers to something that can be experienced with any of the five senses - touch, sight, taste, smell, and hearing - and is a specific, tangible object. By contrast, an abstract noun refers to ideas or concepts that cannot be directly experienced with the senses.
Merriam-Webster defines sense as related to sensations, which aligns more with abstract thinking than something tangible. Happiness and other emotions like humor are abstract concepts because they are ideas that we feel mentally rather than physically. On the other hand, Rolando is a person's name, and people are concrete because you can see, touch, and interact with them. Therefore, the only concrete noun in the sentence is Rolando.