If you come across my keys; bring them to me; can’t you?
If you come across my keys; bring them to me; can’t you?
A: don’t you
B: isn’t you
C: can’t you
D: None of these
The clause is imperative in force and requests help. Natural tags for polite requests are will you or can you without contraction in this context. The given tags do not match correct form or polarity. Therefore none is acceptable. Remember that request tags often take will you or would you in standard usage.