P is an alcohl which on heating with `Al_(2)O_(3)` forms an alkene Q.Q on ozonolysis produces R and S. When the mixture of R and S is heated with NaOH, a redox reaction takes place and a mixture of an acid salt and alcohol is formed.
The alcohol (P) is obtained by :
A. `H_(3)C-underset(O)underset(||)(C)-CH_(2)-CH_(3)+CH_(3)MgBr`
B. `CH_(3)-overset(CH_(3))overset(|)(C)-H-CH_(2)-CH=O+CH_(3)MgBr`
C. `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(CH)-CH_(2)MgBr+CH_(3)=O`
D. `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(CH)-CH_(2)-COCl+CH_(3)MgCl`
