Why not is turned my hand into?

[Kolombino]

ESL/EFL Test "Story (1)", question 4

I had of course turned my hand ......... many jobs during the vacation periods but waiting was certainly the most difficult.

(a) to
(b) into
(c) down
(d) out

ESL/EFL Test "Story (1)", answer 4

I had of course turned my hand to many jobs during the vacation periods but waiting was certainly the most difficult.

Correct answer: (a) to

Your answer was: incorrect
I had of course turned my hand into many jobs during the vacation periods but waiting was certainly the most difficult.
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why not is turned my hand into?

[Alan]

Hi English Learner,

Turn into doesn't work here because it means change into/be transformed into.

Alan
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English as a Second Language
You can read my ESL story French or English?