Differences among conduct, control and manage

[FangFang]

Business English Lesson, Advanced Level

ESL/EFL Test #180 "The US Mint", question 7

The primary mission of the United States Mint is to produce an adequate volume of coins for the nation to ......... its trade and commerce.

(a) conduct
(b) control
(c) lead
(d) manage

Business English Lesson, Advanced Level

ESL/EFL Test #180 "The US Mint", answer 7

The primary mission of the United States Mint is to produce an adequate volume of coins for the nation to conduct its trade and commerce.

Correct answer: (a) conduct
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Hello,
How can we tell the differences among "conduct", "control" and "manage"?? Personally I think conduct would be the best choice,but "control" and "manage" are reasonable too.

Thanks
F.F

[Mister Micawber]

,
Hello FangFang,

Conduct in this sentence is quite different from control and manage-- both of the latter suggest that the coined money in some way administers or governs trade; it does not, it is merely used as a medium of trade-- which is what conduct means here: to serve as a medium for conveying; transmit.
.
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Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mr. Micawber