Question

The question below refers to the selection "Lamb to the Slaughter.” The dramatic irony of the officer’s comment that the murder weapon is “Probably right under our very noses” stems from the fact that
Mary's husband isn't really dead.
the officers have no sense of smell.
it literally is right under the officers' noses.
Mary never had a husband in the first place - she made him up.

Answer 1

This stems from the fact that Mary's husband most likely isn't dead.