An organic compound `X` on treatement with acidified `K_(2)Cr_(2)O_(7)` gives a compound `Y` which reats with `I_(2)` and sodium carbonate to form tri-iodomethane. The compound `X` is
A. `CH_(3)-CH_(2)-CH_(2)-OH`
B. `CH_(3)-CH_(2)-O-CH_(3)`
C. `CH_(3)-CH_(2)-CH=O`
D. `CH_(3)CH(OH)CH_3`