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]

.
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

[Baubau]

Can I say "I've decided to choose my mother's trade" in the sense of choosing to be part of her "cast", group of people with the same profession?

Thanks in advance.

[Mister Micawber]

'Trade', when used nowadays, usually refers to craftsmen or commercial concerns-- plumbers, merchants, typesetters. If your mother is of that ilk, then yes.
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Native English teacher at Mister Micawber's