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

Career calling.

A vocation is a "calling," or a strong desire to follow a particular career or profession. In this case, the speaker states that after volunteering at a hospital for a month, he felt that he had discovered his vocation. The implication is that the speaker wants to pursue a career path in something related to healthcare and patient care, such as a doctor or a nurse.

g

explanation:

i think it is d tell if im wrong