Grammar...

[Anonymous]

Is any of these sentences incorrect:

1. Where do I submit my assignment?

2. To where do I submit my assignment?

3. Where do I submit my assignment to?

If all of the above sentences are correct, can you tell me which of them is the best grammatically?

Thank you for your time.

[Rusty]

1. Where do I submit my assignment? (OK).

2. To where do I submit my assignment? (No).

3. Where do I submit my assignment to? (No).

If all of the above sentences are correct, can you tell me which of them is the best grammatically? (To where/where to sounds redundant).