Read the Paragraph and Then Answer the Questions That Follow

Read the paragraph and then answer the questions that follow by selecting the correct response. ​
Casting a vote is really a series of steps, sometimes confusing to the first-time voter. A few weeks prior to an election, you must register to vote with your state election office. When you get to your polling place on Election Day, you will probably need to wait in line to check in. The poll worker will ask for your name to see if you're on the list of registered voters in your area. Depending on your area, you may be asked to show a valid photo ID with your name and address at which you are registered, or a photo ID and proof of residency (for example, a utility bill, pay stub, or other government document with your current address) . After your residency has been confirmed, you will sign your name on a list. Next, a poll worker will show you to a small booth with a curtain or dividers, which keep your voting experience private. Then, depending on the state where you live, you will fill out a paper ballot, punch a card, or use an electronic voting machine to cast your vote. After explaining how you should mark your ballot or work the voting machine, the poll worker will leave you to make your selections. When you are finished, the poll worker may check your ballot to make sure that it correctly shows your votes and then have you place it in a sealed box. Finally, at the end of the day, your vote will be counted!
The subject of this paragraph is

A) how to cast a vote.
B) how to register to vote.
C) how to work at the polls during an election.