Final answer:
The described imagery is tactile because it invokes the sense of touch, making the correct answer a) Tactile.
Step-by-step explanation:
The type of imagery described in the sentence 'After the long run, he collapsed in the grass with tired and burning muscles. The grass tickled his skin, and sweat cooled on his brow.' refers to the sense of touch, therefore the correct answer is a) Tactile. This is because the phrases 'tired and burning muscles,' 'grass tickled his skin,' and 'sweat cooled on his brow' invoke a physical sensation that the reader can imagine feeling, which is characteristic of tactile imagery. Descriptive imagery is meant to immerse the reader in the story by activating one or more of the five senses: sight, sound, smell, touch, or taste.