Arrange the folowing alkanols 1,2 and 3 in order of their reacitivity towards acid catalysed dehydration.
`CH_(3)-underset(CH_(3))underset(|)(CH)-CH_(2)-underset(OH)underset(|)(CH_(2))`
`CH__(3)-overset(OH)overset(|)underset(CH_(3))underset(|)C-CH_(2)-CH_(3)`
`(CH_(3))_(2)CH-overset(OH)overset(|)(CH)-CH_(3)`
A. `1gt2gt3`
B. `2gt1gt3`
C. `2gt3gt1`
D. `3gt2gt1`