Select a suitable preposition to complete the sentence:
I am thankful _____ you for the good advice.
The preposition ‘to’ is used for different reasons in different contexts. One of these is in honour of someone/something and also to show the person or thing that is affected by the action in a given context. In the given sentence, the speaker is thankful ‘to’ the other person for the advice he/she has given. Thus the statement honours the other person and expresses the speaker’s gratitude towards the other person. Hence ‘to’ is the suitable answer, so option C is correct. On the other hand, we cannot use ‘for’ in the given sentence because we use ‘for’ to indicate the reason. Here the reason for gratitude is the ‘the good advice’ and that is why there is a ‘for’ before it. Using ‘for’ twice would once again be grammatically wrong. Thus option A is incorrect. ‘With’ is used to denote a tool/instrument or to show company. The speaker cannot be thankful ‘with’ the other person because it would mean that both of them are thankful together towards something/someone else. Therefore option B is incorrect. Similarly ‘from’ is unsuitable because ‘from’ is used to denote the receiving end. Here the gratitude is shown by the speaker to the other person, so option D is incorrect.