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The missing structures A and B in the re...

The missing structures A and B in the reaction sequence :
`R - CH_(2) - CH_(2) OH underset(350^(@) C)overset(Al_(2)O_(3)) to r - CH = CH_(2)` are given by the set :

A

`CH_(3) OH, RCOOH`

B

Methanal, RCHOHR

C

Ethanal, RCOOH

D

Methanal , `RCH_(2) OH`

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The correct Answer is:
D
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