Which is the most often a cause for a change in career or lifestyle

adjustments in life roles (b on edg.)

Explanation:

for the answers it gives:

adjustments in vacation; vacation is temporary it would not be necessary to change career paths.

adjustments in life roles: if something in your life comes up it may change the actions and steps you must take to over come including a career change.

career satisfaction; if you're satisfied for your career you will not want to leave.

lifestyle satisfaction; when you're satisfied with your life there's not much you need to change.

answer: "the beating heart symbolizes the narrator's conscience, or his sense of guilt and wrongdoing" so its b

explanation:

"to look at him, or hear him describe it, he had no guilt. however, poe decided to symbolize this man's subconscious guilt through the heartbeat."