Bachelor or Married again

Sardars Friend: Yaar,
Last Year The Name Plate Outside Your House
Read Santa Singh, B.A.
This Year It Reads Santa Singh, M.A.
When Did You Finish Your Masters Degree?
Sardar: You Dont Understand.
Last Year My Wife Died,
I Put B.A. To Indicate Bachelor Again.
Then I Took A Second Wife, So M.A. Is Married Again.