Janice mixed an orange solution of sodium sulfide with a clear solution of hydrochloric acid. She noticed after a minute that the solution smelled something like rotten eggs. What could she reasonably infer from the odor released by the solution?
A.
Hydrochloric acid must smell like rotton eggs.
B.
A chemical reaction may have occurred.
C.
Chemical changes always produce odors.
D.
A chemical reaction must have occurred.
plz help