Answer
B
Work Step by Step
a) This wouldn't form $NH_4OH$ and thus won't release any gas.
b) $CO_3^{2-}+H_3O^+\rightarrow H_2CO_3+H_2O\rightarrow H_2O+ CO_2 $
c) No gas product is possible.
d) No gas product is possible.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.