I look forward . . . . . . . . meeting you next month? A. at B. for C. to D. with

The correct answer is C. to.

The word “to” is used to express a future intention or expectation. In this case, the speaker is expressing their intention to meet the listener next month.

The other options are incorrect because they do not express a future intention or expectation.

• The word “at” is used to indicate a location or position. In this case, it would not make sense to say that the speaker is looking forward at meeting the listener.
• The word “for” is used to indicate a reason or purpose. In this case, it would not make sense to say that the speaker is looking forward for meeting the listener.
• The word “with” is used to indicate a person or thing that is associated with something else. In this case, it would not make sense to say that the speaker is looking forward with meeting the listener.