Meaning of "portfolio" in this context

[Colombina]

Business English Lesson, Advanced Level

ESL/EFL Test #20 "Money Matters (3)", question 5

The best way to develop an income for the future is to invest in a series of companies and in that way to build up a ..........

(a) suitcase
(b) portfolio
(c) folder
(d) briefcase

Business English Lesson, Advanced Level

ESL/EFL Test #20 "Money Matters (3)", answer 5

The best way to develop an income for the future is to invest in a series of companies and in that way to build up a portfolio.

Correct answer: (b) portfolio

Your answer was: incorrect
The best way to develop an income for the future is to invest in a series of companies and in that way to build up a suitcase.
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Dear Sir/Madam,

Could you please explain about the meaning of "portfolio" in this context? Thanks.

Regards
Colombina

[Mister Micawber]

.
Portfolio = the sum of the financial assets held by an individual or a bank or other financial institution.
.
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Native English teacher at Mister Micawber's