During the drafting stage of the writing process, you

a. check your work for grammar, spelling, and punctuation

b. explore and narrow your topic and gather details

c. keep the focus of the specific form you have in mind

d. revise your work for clarity and word choice

c. keep the focus of the specific form you have in mind.

The other items mentioned are done in other parts of the process.

Exploring and narrowing your topic and gathering details  -- these happen during the research phase.

Doing the actual writing (including keeping the focus of the specific form you have in mind) happens in the drafting phase, as you write a draft of your paper.

Revise your work for clarity and word choice as well as checking your work for grammar, spelling, and punctuation  -- these are parts of the final revision process.

d. the two authors are in awe of nature; their experiences, reveal that time in nature can change people.

explanation:

it is the background information on the characters and setting explained at the beginning of the story. the exposition will often have information about events that happened before the story began. the exposition is often the very first part of the plot.