[单选题]
The mass spectrum of compound X features a ga-hw chi9igr7s;b v4i45 c:tfrvehzl)q: ms1 0 6hkyq(agment 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