`{:(CH_(3)MgBr//H^(+),KMnO_(4)" (cold dil.)",CrO_(3),H^(+)//Delta),((1),(2),(3),"(4)"):}`
For the above conversion the correct order of reagents used is :
A. `1 rarr 2 rarr 3 rarr 4`
B. `1 rarr 4 rarr 3 rarr 2`
C. `1 rarr 4 rarr 2 rarr 3`
D. `2 rarr 3 rarr 4 rarr 1`