The correct option is A.
Dashes are used in sentences to show interruption is speech or to show a sudden break in a sentence. For instance: Will mummy - can she- find out what we have done?
Dash can also be used to give more detailed information about a particular thing. For instance: My boss - I mean, my former boss - wanted me to go out with him.<span />
Try skimming through the pages.
Answer:
1.They got together, conversed, and dispersed, but to no avail.
2.He came, he saw, and he conquered.
3.He wanted to have a new house to live in, and a new car to drive.
4.The applicant was approached through telephone, email, and snail mail.
Explanation:
Answer:

I understand. I am currently Ace rank, and even I have to ask questions sometimes to keep in check.