Profession vs. business?

[Randolf]

Synonyms Lesson, Advanced Level

ESL/EFL Test #122 "Synonyms for business and employment", question 9

Although I don't feel it as my calling, I have decided to choose my mother's ......... and become a lawyer. I know this will make her happy.

(a) business
(b) profession
(c) trade
(d) employment

Synonyms Lesson, Advanced Level

ESL/EFL Test #122 "Synonyms for business and employment", answer 9

Although I don't feel it as my calling, I have decided to choose my mother's profession and become a lawyer. I know this will make her happy.

Correct answer: (b) profession

Your answer was: incorrect
Although I don't feel it as my calling, I have decided to choose my mother's business and become a lawyer. I know this will make her happy.
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why is profession a correct answer? I need explaination

[Mister Micawber]

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Being a lawyer, a doctor, a plumber, etc is a profession, not a business.
.
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Native English teacher at Mister Micawber's