You called on me when I was not at home, don't you?

Options

A. did you?
B. didn'tyou?
C. didn't!?
D. No Improvement

Answer

B

Explanation

(2) Positive Sentence (without.Auxiliary) rarr Negative Tag Tag structure rarr do/did/does+ not
Hence. didn.t you ? (Past Tense) is the right usage