[单选题]
The mass spectrum of compound X features ad xo(qr6xew ;ast 19+y fra1e (hu 6v rn z(xc/5h/e2txkpjgment ion peak at an $m/z$value 31 units lower than the molecular ion peak.
The $^1H$ NMR spectrum of the compound is shown.
Which of the following is the most likely structural formula of compound $X$?
Atomic masses ($amu$):C=12, H=1H=1, O=16O=16