What are conference arrangements?

[Lotinmaxceau]

Common Errors in English, Advanced Level

ESL/EFL Test #6 "At the Conference", question 10

At the end of the conference organisations had been made for all members who had come by train to be taken by taxi to the station.

(a) At the end
(b) organisations
(c) had come
(d) to be taken

Common Errors in English, Advanced Level

ESL/EFL Test #6 "At the Conference", answer 10

At the end of the conference arrangements had been made for all members who had come by train to be taken by taxi to the station.

Correct entry: arrangements
The error was: (b) organisations
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what word do I use to correct this sentence?

[Mister Micawber]

arrangements
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Native English teacher at Mister Micawber's