An alcohol (a) on dehydration gives (B), which on ozonolysis gives acetone and formaldehyde.(B) decolourises alkaline `KMnO_(4)` solution but (A) doies not .(A) and (B) are respectively:
A. `CH_(3)CH_(2)CH_(2)CH_(2)OH and CH_(2)CH_(2)CH=CH_(2)`
B. `CH_(3)CH_(2)-underset(OH)underset(|)(CH)-CH_(2) and CH_(2)-CH=CH=CH_(2)`
C. `(CH_(3))_(3)C-OH and (CH_(3))_(2)C=CH_(2)`
D. `(CH_(3))_(3)CHCH_(2)-OH and (CH_(3))_(2)C=CH_(2)`
