Which Sequence of Steps Below Describes the Best Synthesis of 5-Oxohexanoic

Which sequence of steps below describes the best synthesis of 5-oxohexanoic acid starting with 1-methylcyclopentan-1-ol?

A) 1. Conc. KMnO₄
2. Dry gaseous HBr
3. mg/ether
4. CO₂
B) 1. H₂SO₄ and heat
2. Conc. KMnO₄
C) 1. Conc. KMnO₄
2. CH₃MgBr/ ether
3. H₃O⁺
D) 1. H₂SO₄ and heat
2. O₃
3. (CH₃) ₂S
4. PCC
E) 1. H₂SO₄ and heat
2. Conc. KMnO₄
3. LiAlH₄
4. H₃O⁺