The answer is A: things that writers do.
Explanation for each option:
a. Things that writers do: This is the correct answer. When students read a lot, they become more attuned to the techniques and styles that writers use. They start to notice patterns in storytelling, character development, dialogue, and other literary devices. This awareness can enhance their own writing skills and deepen their appreciation of literature.
b. Their surroundings: While reading can sometimes make students more observant in general, this option is less directly related to the act of reading itself. It is more about being mindful and present in one's environment, which is not necessarily a direct outcome of extensive reading.
c. Colors and textures in nature: This option is more related to visual and sensory observation rather than reading. While descriptive passages in literature can enhance one's appreciation of nature, it is not the primary thing students notice from reading a lot.
d. Details: Although reading can improve attention to detail, this option is too broad. It does not specifically address the literary techniques and elements that students become more aware of through extensive reading.
In summary, the primary thing that students notice when they read a lot is the various techniques and methods that writers use to craft their stories and convey their messages.