What mark of punctuation is most closet associated with interjections

Read this sentence from the interview. when i say that an actor is natural, i mean that he appears to act in accordance with his ideal, in accordance with his nature, and that he is not an imitator or a copyist—that he is not made up of shreds and patches taken from others, but that all he does flows from interior fountains and is consistent with his own nature, all having in a marked degree the highest characteristics of the man. how does the phrase "flows from interior fountains" affect the interview? a-it suggests that actors have more to give of themselves than other people do. b- it suggests that actors try their hardest to create believable characters. c- it suggests that actors include a part of their own essence in the roles they play. d- it suggests that actors have an abundance of emotions that they must release.

Which of these can an adverbial clause modify?

Iwill have sailed around the world by the end of next year. what is the verb form in the sentence? future perfect past emphatic present progressive past perfect