Select the appropriate method of converting 4-methyl-1-pentene into 3-methylbutanoic acid.

a. 1. CCl₄​; 2. excess NaNH₂​; 3.O₃​; 4.H₂​O
b. 1. Br₂​,CCl₄​; 2. excess NaNH₂; 3.H₂​O
c. 1. Cl₂​,CCl₄​; 2.NaNH2​; 3.H₂​O; 4.O₃​; 5.H₂​O
d. 1. O₃​; 2.H₂​O; 3,CCl₄​; 4. excess NaNH₂​; 5.H₂​O
e. 1. Br₂​,CCl₄​; 2, excess NaNH₂​; 3.H₂​O; 4.O₃​; 5⋅H₂​O