has been developed vs. has been developing

[Maddy]

English Language Tests, Intermediate level

ESL/EFL Test #883 "The History of Coffee", question 10

Coffee is grown in more than 50 countries; the flavor varies because of the particular soil characteristics. From Hawaii's rich volcanic soil, Mexico's mountainous region, Puerto Rico's acidic soil, or the slightly sweet soil of Columbia, a coffee has been ......... to suit everyone's taste.

(a) developing
(b) develops
(c) developer
(d) developed

English Language Tests, Intermediate level

ESL/EFL Test #883 "The History of Coffee", answer 10

Coffee is grown in more than 50 countries; the flavor varies because of the particular soil characteristics. From Hawaii's rich volcanic soil, Mexico's mountainous region, Puerto Rico's acidic soil, or the slightly sweet soil of Columbia, a coffee has been developed to suit everyone's taste.

Correct answer: (d) developed

Your answer was: incorrect
Coffee is grown in more than 50 countries; the flavor varies because of the particular soil characteristics. From Hawaii's rich volcanic soil, Mexico's mountainous region, Puerto Rico's acidic soil, or the slightly sweet soil of Columbia, a coffee has been developing to suit everyone's taste.
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Please could you explain to me why developing is incorrect.

[Mister Micawber]

Coffee does not develop itself; people must develop it. Therefore, coffee cannot 'be developing'; it is either 'being developed' or in this case it 'has been developed' (passive voice).
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Native English teacher at Mister Micawber's

[Maddy]

[Joao]

Where exactly is "Columbia" located?

[Beeesneees]

Have you tried a map, Joao, or is this your way of pointing out that the spelling in this case should probably be 'Colombia' (the South American state) rather than 'Columbia' (in North America)?
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Cheers m' dears!