I went for a tour vs. I went on a tour?

[Tory]

English Grammar Tests, Elementary Level

ESL/EFL Test #122 "Real Life: Grocery Stores (2)", question 1

Once a shopper pays for his/her groceries, the groceries are put into either plastic or paper ..........

(a) nets
(b) vessels
(c) bags
(d) wallets

English Grammar Tests, Elementary Level

ESL/EFL Test #122 "Real Life: Grocery Stores (2)", answer 1

Once a shopper pays for his/her groceries, the groceries are put into either plastic or paper bags.

Correct answer: (c) bags
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which one is the correct sentence, I went for a tour or I went on a tour?

[Mister Micawber]

.
Both are fine.
.
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Native English teacher at Mister Micawber's