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_(3)CH_(2)CH=CH_(2)`
B. `CH_(2)CH_(2)-underset(OH)underset(|)CH-CH_(3) and CH_(3)-CH=CH-CH_(3)`
C. `(CH_(3))_(3)C-OHAND(CH_(3))_(2)C=CH_(2)`
D. `CH_(3)-CH_(2)C-underset(OH)underset(|)CH-CH_(3) AND(CH_(3))_(2)C=CH_(2)`
