What is the meaning of the word "vocation" as it is used in the following sentence?

after volunteering at the hospital for a month, i felt i had discovered my vocation.

determination
career calling
comfort level
ultimate challenge

Maria is writing a persuasive essay for her english class. she asks marshall if it is important to use rhetorical appeals in her essay.which reasons could marshall give in favor of using rhetorical appeals

Although alice walker published a number of essays, poetry collections, and stories during the 1970s, her third novel, the color purple, ) which was published in 1982, brought her the widest acclaim in that it won both the national book award as well as the pulitzer prize (b) published in 1982, bringing her the widest acclaim by winning both the national book award and the pulitzer prize (c) published in 1982, brought her the widest acclaim, winning both the national book award and the pulitzer prize (d) was published in 1982 and which, winning both the national book award and the pulitzer prize, brought her the widest acclaim (e) was published in 1982, winning both the national book award as well as the pulitzer prize, and bringing her the widest acclaim

What are themes in exhalation by ted chiang