Question

Fill in the blank with the most appropriate prepositions:
The police warned the people ____ pickpockets.

• A. For
• B. Against
• C. Of
• D. An

Answer 1

The correct option is C Of

Here, 'of' is correct because it implies relating to somebody, here it is the pickpockets.
'For' is incorrect because it is used to show who is intended to have or use something or where something is intended to be put.
'Against' is incorrect because it implies opposing or disagreeing with somebody/something.
'An' is grammatically incorrect.