the question is asking for a suite for a solo instrument
par·ti·ta/pärˈtētə/
Noun:
A suite, typically for a solo instrument or chamber ensemble.
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From a musical point of view both Partita and Cantata are correct because the voice is also an intrument, so I feel that they should accept either answer, but most probably would be looking for Partita.
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Daily Telegraph General Knowledge (GK) Saturday July 14th 2012